Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Thailand - Pioneers of Aviation - 1912 (July 13), stationery postcard with black surcharge 5s on 1½a red on buff paper, pre-printed invitation of German Fleet Club for upcoming lecture of Mr. Vorsitzenden about Flying Machines, fresh, VF and rare, Est. $200-$250