Switzerland, Semi-Official Airmails. O.g., 6 different on exhibit page with photocopy of flight card, consists of Zumstein #P4, P5, P7, P9, P14 and P36, seldom offered, Fine to Very Fine. 2010 Zumstein 1,850 SFr. Estimate $450-550. Dealer Harmer-Schau Auction Minimum Bid: 350.00 US$ (via Philasearch.com: Harmer Schau Auction - item 40-A98-3134)
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