This attractive, uncommon, uprated(w/1/2(w/ some perf damage)+1/4-Piaster definitives of Austrian Post Offices in the Ottoman Empire!), commemorative(celebrating the 1911 International Postage Stamp Exhibition in Vienna!), 5-Heller, Austrian postal stationery card(w/ some minor stains, and creases and a small tear) was mailed on September 17, 1911, from Vienna(neat, green, commemorative cancels!), Austria, to a Herrn. Josef Chowanets, Post Ober Kaserne(?; an Austrian Army base?) Znaim, Austria, now in Czechia! Austrian Post Office in the Ottoman Empire postage due stamps were acceptable for use in Austria at that time as regular postage stamps. The Austrian Post Office needed to get rid of a glut of them! Noted imperfections aside, this uprated, commemorative postal stationery card remains a nifty piece of Austrian postal history connected to commemorating the 1911 International Postage Stamp Exhibition in Vienna!