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      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>206964</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>116867</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>133444</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>97590</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>24453</CurrentTaxYearAmt>
        <TotalAmt>579318</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>206964</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>116867</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>133444</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>97590</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>24453</CurrentTaxYearAmt>
        <TotalAmt>579318</TotalAmt>
      </TotalCalendarYear170Grp>
      <PublicSupportTotal170Amt>579318</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>39345</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>58366</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>37993</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>31932</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>29712</CurrentTaxYearAmt>
        <TotalAmt>197348</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <OtherIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>41455</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>7353</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>17188</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearAmt>374</CurrentTaxYearAmt>
        <TotalAmt>66370</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>843036</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>374</GrossReceiptsRltdActivitiesAmt>
      <PublicSupportCY170Pct>0.68720</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.73580</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>PART II, LINE 10</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER INCOME 66,370</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
    </IRS990ScheduleA>
    <IRS990ScheduleD documentId="RetDoc2">
      <SolicitedAssetsSaleInd>false</SolicitedAssetsSaleInd>
      <CYEndwmtFundGrp>
        <BeginningYearBalanceAmt>753095</BeginningYearBalanceAmt>
      </CYEndwmtFundGrp>
      <CYMinus1YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>921730</BeginningYearBalanceAmt>
        <InvestmentEarningsOrLossesAmt>-155055</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>37226</OtherExpendituresAmt>
        <AdministrativeExpensesAmt>8354</AdministrativeExpensesAmt>
      </CYMinus1YrEndwmtFundGrp>
      <CYMinus2YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>859419</BeginningYearBalanceAmt>
        <InvestmentEarningsOrLossesAmt>155251</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>84243</OtherExpendituresAmt>
        <AdministrativeExpensesAmt>8697</AdministrativeExpensesAmt>
      </CYMinus2YrEndwmtFundGrp>
      <CYMinus3YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>827254</BeginningYearBalanceAmt>
        <InvestmentEarningsOrLossesAmt>117668</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>87673</OtherExpendituresAmt>
        <AdministrativeExpensesAmt>7825</AdministrativeExpensesAmt>
      </CYMinus3YrEndwmtFundGrp>
      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>716151</BeginningYearBalanceAmt>
        <InvestmentEarningsOrLossesAmt>146987</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>28097</OtherExpendituresAmt>
        <AdministrativeExpensesAmt>7787</AdministrativeExpensesAmt>
      </CYMinus4YrEndwmtFundGrp>
      <EndowmentsHeldUnrelatedOrgInd>true</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
      <LandGrp>
        <OtherCostOrOtherBasisAmt>21149</OtherCostOrOtherBasisAmt>
        <BookValueAmt>21149</BookValueAmt>
      </LandGrp>
      <TotalBookValueLandBuildingsAmt>21149</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>COLLECTIONS</Desc>
        <BookValueAmt>164000</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>SECURITY DEPOSIT</Desc>
        <BookValueAmt>1250</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>165250</TotalBookValueOtherAssetsAmt>
    </IRS990ScheduleD>
    <IRS990ScheduleO documentId="RetDoc3">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 - ORGANIZATION'S MISSION</FormAndLineReferenceDesc>
        <ExplanationTxt>OSMA OPERATES THE SLATER INDUSTRIAL ARCHIVES TO PRESERVE AND PROVIDE ACCESS TO ITS SPECIAL COLLECTIONS FOR THE BENEFIT OF ALL PEOPLE, AND TO INFORM THE INTERPRETATION OF THE OLD SLATER MILL NATIONAL HISTORIC LANDMARK AND THE HISTORY OF THE AMERICAN TEXTILE INDUSTRY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ORGANIZED WITH MEMEBERS. ALTHOUGH, AN AMENDMENT TO ARTICLE III OF THE OSMA BY-LAWS ON JUNE 24, 2021 REDEFINED MEMBERS OF THE CORPORATION AS THOSE INDIVIDUALS ELECTED TO SERVE ON THE BOARD OF TRUSTEES, ELIMINATING OPEN MEMBERSHIP BY ANNUAL FEE OR SERVICE TO THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE DIRECTOR AND THE TREASURER REVIEW THE 990 PRIOR TO FILING. THE MEMBERS OF THE BOARD ARE PROVIDED A COPY OF THE FILED DOCUMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>AVAILABLE UPON REQUEST</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>OUTSIDE SERVICES 11,532 4,119 824</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9</FormAndLineReferenceDesc>
        <ExplanationTxt>CHANGE IN MV - ENDOWMENT 27,181</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>