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Transport without 'c' after face value - Part of a definitive set of 31 stamps

Issue date: 16th August 1988
21 c Olive green Railroad mail car (RPO) No. 49, 1922 (horizontal coil stamp with red inscription "Presorted First Class")

 

Circulation: ???

Perforation: 9½ vertical
Catalog No.:   M ??? - S 2265 - SG 2172d - YT ???