1937, legion Condor, letter with 12 Pf Hindenburg with postal stamp BERLIN NW 7 from 8.7.37 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 7. July 1937 on the letter back, rare, the envelope has a number of tears, the with sellotape pasted up are, Michel 600, 00 (former starting price 150)