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        <OtherExpendituresAmt>77135</OtherExpendituresAmt>
        <AdministrativeExpensesAmt>10202</AdministrativeExpensesAmt>
        <EndYearBalanceAmt>2503889</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
      <CYMinus3YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>2155002</BeginningYearBalanceAmt>
        <ContributionsAmt>21846</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>563761</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>251388</OtherExpendituresAmt>
        <AdministrativeExpensesAmt>10935</AdministrativeExpensesAmt>
        <EndYearBalanceAmt>2478286</EndYearBalanceAmt>
      </CYMinus3YrEndwmtFundGrp>
      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>2174141</BeginningYearBalanceAmt>
        <ContributionsAmt>272190</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-76943</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>203853</OtherExpendituresAmt>
        <AdministrativeExpensesAmt>10533</AdministrativeExpensesAmt>
        <EndYearBalanceAmt>2155002</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
      <BoardDesignatedBalanceEOYPct>0.46111</BoardDesignatedBalanceEOYPct>
      <PrmnntEndowmentBalanceEOYPct>0.53889</PrmnntEndowmentBalanceEOYPct>
      <TermEndowmentBalanceEOYPct>0.00000</TermEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>0</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>0</EndowmentsHeldRelatedOrgInd>
      <LandGrp>
        <OtherCostOrOtherBasisAmt>53800</OtherCostOrOtherBasisAmt>
        <BookValueAmt>53800</BookValueAmt>
      </LandGrp>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>9955149</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>6674124</DepreciationAmt>
        <BookValueAmt>3281025</BookValueAmt>
      </BuildingsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>1514036</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1392772</DepreciationAmt>
        <BookValueAmt>121264</BookValueAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>3456089</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>CHARITABLE GIFT ANNUITY OBLIGATION</Desc>
        <Amt>131608</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>OBLIGATION UNDER OPERATING LEASES</Desc>
        <Amt>26163</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>157771</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>2876979</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>445018</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>-1505</OtherRevenueAmt>
      <RevenueNotReportedAmt>443513</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>2433466</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>21231</InvestmentExpensesNotIncldAmt>
      <OtherRevenuesNotIncludedAmt>363</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>21594</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>2455060</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>2594976</TotExpnsEtcAuditedFinclStmtAmt>
      <OtherExpensesIncludedAmt>26107</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>26107</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>2568869</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>21231</InvestmentExpensesNotIncld2Amt>
      <OtherExpensesNotIncludedAmt>363</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>21594</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>2590463</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 1A:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE NAWCC'S COLLECTIONS ARE MADE UP OF HOROLOGICAL ARTIFACTS AND RESEARCH MATERIALS OF HISTORICAL SIGNIFICANCE THAT ARE HELD FOR EDUCATIONAL, RESEARCH, AND CURATORIAL PURPOSES. EACH OF THE ITEMS IS PRESERVED AND CARED FOR AND ACTIVITIES VERIFYING THEIR EXISTENCE AND ASSESSING THEIR CONDITION ARE PERFORMED CONTINUOUSLY. THE COLLECTIONS ARE SUBJECT TO A POLICY THAT REQUIRES PROCEEDS FROM THEIR SALES TO BE USED TO ACQUIRE OTHER ITEMS FOR THE COLLECTION OR FOR CONSERVATION OF ITEMS IN THE COLLECTION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S COLLECTIONS ARE MADE UP OF HOROLOGICAL ARTIFACTS AND RESEARCH MATERIALS OF HISTORICAL SIGNIFICANCE THAT ARE HELD FOR EDUCATIONAL, RESEARCH, AND CURATORIAL PURPOSES. EACH OF THE ITEMS IS PRESERVED AND CARED FOR AND ACTIVITIES VERIFYING THEIR EXISTANCE AND ASSESSING THEIR CONDITION ARE PERFORMED CONTINUOUSLY. THE COLLECTIONS ARE SUBJECT TO A POLICY THAT REQUIRES PROCEEDS FROM THEIR SALES TO BE USED TO ACQUIRE OTHER ITEMS FOR THE COLLECTIONS. THE INSURANCE COVERAGE IN EFFECT FOR ITEMS IN THE COLLECTION AMOUNTED TO $9,000,000.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INTENDED USE OF THE ORAGNIZATION'S ENDOWMENT FUND IS FOR THE MUSEUM, LIBRARY, EDUCATION, AND NAWCC.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>ACCOUNTING PRINCIPLES GENERALLY ACCEPTED IN THE UNITED STATES OF AMERICA REQUIRE MANAGEMENT TO EVALUATE TAX POSITIONS TAKEN BY THE NAWCC, INCLUDING WHETHER THE ENTITY IS EXEMPT FROM INCOME TAXES. MANAGEMENT EVALUATED THE TAX POSITIONS TAKEN AND CONCLUDED THAT THE NAWCC HAS TAKEN NO UNCERTAIN TAX POSITIONS THAT REQUIRE RECOGNITION OR DISCLOSURE IN THE FINANCIAL STATEMENTS. THEREFORE, NO PROVISION OR LIABILITY FOR INCOME TAXES HAS BEEN INCLUDED IN THE FINANCIAL STATEMENTS. WITH FEW EXCEPTIONS, THE NAWCC IS NO LONGER SUBJECT TO INCOME TAX EXAMINATIONS BY THE U.S. FEDERAL, STATE, OR LOCAL TAX AUTHORITIES FOR YEARS BEFORE 2021.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>CHANGE IN VALUE OF CHARITABLE GIFT ANNUITY -8,976. COST OF GOODS SOLD 26,107. BOOK/TAX DIFFERENCE ON REALIZED GAIN 8,750. INVENTORY WRITE OFF -27,386.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER: MUSEUM COLLECTIONS 363.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>COST OF GOODS SOLD 26,107.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER: MUSEUM COLLECTIONS 363.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <BooksAndPublicationsGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <NoncashContributionsRptF990Amt>6290</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </BooksAndPublicationsGrp>
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>2</ContributionCnt>
        <NoncashContributionsRptF990Amt>15887</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <CollectiblesGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>33</ContributionCnt>
        <NoncashContributionsRptF990Amt>547267</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </CollectiblesGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>TRAVEL EXPENSES</Desc>
        <ContributionCnt>20</ContributionCnt>
        <NoncashContributionsRptF990Amt>23112</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>SUPPLIES</Desc>
        <ContributionCnt>10</ContributionCnt>
        <NoncashContributionsRptF990Amt>2494</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>0</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 1C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION DID NOT HAVE ANY INSTANCES WHERE BACKUP WITHHOLDING WAS REQUIRED; HOWEVER, IF THE SITUATION WOULD ARISE, THE ORGANIZATION IS AWARE OF THE REPORTING REQUIREMENTS AND WOULD HANDLE THAT ACCORDINGLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS DIFFERENT LEVELS OF MEMBERSHIPS BASED ON CONTRIBUTIONS. BRASS, SILVER, GOLD, PLATINUM, RUBY, AND DIAMOND MEMBERS HAVE VOITING RIGHTS. INDIVIDUAL, YOUTH, STUDENT, AND INTRODUCTORY MEMBERS DO NOT HAVE VOTING RIGHTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS ELECT 7 OF THE 12 BOARD MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS MUST APPROVE CHANGES TO THE BYLAWS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS EMAILED TO BOARD OF DIRECTORS BEFORE THEIR NEXT BOARD MEETING FOR REVIEW AT THE BOARD MEETING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH BOARD MEMBER IS REQUIRED TO SIGN OR RESIGN A NEW FORM EVERY TWO YEARS OR IF ANY ITEMS CHANGE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE COMMITTEE COLLECTS SALARY AND BENEFIT INFORMATION FROM OTHER ORGANIZATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>NAWCC MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST AND VIA THE ORGANIZATION'S WEBSITE</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>CHANGE IN VALUE OF CHARITABLE GIFT ANNUITIES -8,976. BOOK/TAX DIFFERENCE ON GAIN 8,750. INVENTORY WRITE OFF -27,386.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2C EXPLANATION</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FINANCE COMMITTE ASSUMES RESPONSIBILITY FOR OVERSIGHT OF THE AUDIT AND THE SELECTION OF AN INDEPENDENT ACCOUNTANT.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>