25 Pfg special airmail stamp Mühlhausen Feldberg with corr. Viol. It a wonderful was sight commerative cancel of the 11th SEP.1913 on a private picture postcard with photo the corr. biplane airplane para. notation ". Photo of one's own "!The card was mailed in "MÜHLHAUSEN" only on 9-18 and transported to Basel/Switzerland with a corr. 10 Pfg Germania stamp itself. The airmail stamp was stuck on a little wavily with glue (the stamp was fastened presumably somewhere else in front of 9-18-13 because the private picture postcard wasn't produced before yet), an interesting piece of evidence!