Heinrich Köhler 384 Auction – Day 2 Single Lots & Airmail and Zeppelin Mail – inclusive the collection of the Sieger family

1912/22, ½ a. ultramarine, 2 vertical pairs imperforated between, one with normal stamps as a strip of four, tied to reverse of postal stationery envelope ½ a., as correct payment for a registered letter. The value tablet of the envelope partly cut away, due to opening, otherwise very fine. A very rare entire. Certificate ISES (2022)