1937, legion Condor, letter with content and 12 Pf Hindenburg with postal stamp BERLIN NW 7 from 29.7.37 of a member of the legion Condor from Spain to Baden Baden as well with coded unit designation 1. F. 88 ( = 1. Battery flak battalion 88) over and under the postage stamp and red date entrance stamp 28. July 1937 on the letter back, rare, the envelope has at the upper margin a pulled out and is at the right margin shortened, Michel 600, 00 (former starting price 150)