Lot 330
Borck-Brück Flight, Airmail stamp with additional franking Germania 5 pfg. tied by special cachet "FLUGBEFÖRDERUNG BORK-BRÜCK * 25 JUN. 1912 * DURCH GRADEFLIEGER" resp. cds "BRÜCK 18.7.12" to picture postcard showing "Grade-Fliegerschule, BORK", fine
