III Automobile Balloon Chase 1935, letter sent on 5.V.1935 by balloon on the route Mościce-Borzęcin, and further by normal mail to Bydgoszcz, stamp cancelled with a commemorative stamp in black, since mail sent by Balloon Post should be paid like express mail, the post office marked with a "T" stamp the surcharge to be collected, a 10 gr. surcharge stamp; additional stamp: "MOŚCICKI KLUB BA...