Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Switzerland - Dornier ''Do-X'' Flight - 1932 (September 14), ''Zurich - Altenrhein'' Flight registered cover to Netherlands, franked by two air post values, oval confirmation cachet, Staad Rorschach the same day drop, Assen ''16.XI.32'' arrival ds on reverse, VF, Est. $150-$180, Scott #C16, C18