Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1187:
1935, Mikhail Kalinin, perforated (13¾) trial color proof of 10k in green, nicely centered, no gum (probably removed from a presentation card), VF and scarce, a common stamp of 10k in slate blue is included, Est. $800 -$1,200 , Sc. #575
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