| 29 September 1980 'Sydpex 80' National Philatelic Exhibition at Sydney Town Hall, (APM 8920 + 8921) |
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| 29 September 1980 'Sydpex 80' National Philatelic Exhibition at Sydney Town Hall, (APM 8920 + 8921). On PSE 29 featuring Sydney Post Office 1850. Front postmarked on 29 SEP 1980 in Green, backmarked 6 OCT 1980 in Red
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Item #: INV-69973
Condition Pmk
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