541 | Switzerland

Automatically generated translation

English Yvert 9, 12, 13, 16. 1934. 50 cts black and red, 1 f violet, 35 cts orange-brown and 15 cts green. Round trip airmail to Zurich. Carried on the 1st Flight Zurich-Istanbul-Zurich. Postmark SWISSAIR / BALKANFLUG, in red, and on the front flight markings, in red, and transit ISTANBUL. MAGNIFICENT AND RARE.

International Auction #136

Wednesday, 7 October 2026 | 16:00

Lot 541

Starting price 40€

Illustrative price in other currencies

$ 45
£ 34
CHF 37

Updated 2026-10-02 00:00:05

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Technical editor of the description:
Hermenegildo Trillo Barragán

Philatelic technician of Spain, Colonies and Worldwide

htrillo@iberphil.com