Translating the German into English, it reads:
Austro-Hungarian seaplane with
destroyed an Italian Caproni.
Austrian industrial plants
Warchalowski, Eissler & Co. AG
I believe the poster advertises the fact that German air superiority in shooting down the Italian Caproni bomber – perhaps a Ca.1, Ca.2 or a Ca.3. I’d guess Ca.3, seeing as how it was the new bomber on the block back in 1916 – was due to the magnificence of the Heiro engine in the Austro-Hungarian seaplane (actually a flying boat) fighting alongside Germany, built by the firm of Warchalowski, Eissler & Co. AG.
The Heiro engine business was purchased in 1925 by StEG, the “Imperial Royal Privileged Austrian State Railroad Company”, that became known as Austria Email AG, having the majority of its shares purchased in 2011 by Treibacher Industrieholding AG that, through its subsidiaries, manufactures and markets water heating equipment and offers advanced ceramic materials, hard metals and energy storage products. The company is based in Althofen, Austria.
Back in WWI, the Heiro engines mentioned were built, under contract, by Warchalowski, Eissler & Co. AG. and the Breitfeld-Daněk company of Czechoslovakia.
These Heiro engines were very much respected for their design and power (in the day).
In 1914, Otto Hieronimus manufactured the six-cylinder Hiero E, also known as the Hiero 6 engine, which powered many of Austria’s aeroplanes during the war.
Heironimus was a well-known Austrian auto racer of the early 1900s and designed engines that were liquid (water)-cooled inline engines. On the Heiro engines, the intake was on the right and the exhaust on the left.
As for the luckless Italian plane being shot down in the poster – the Caproni bombers were actually a very successful heavy bomber used during WWI by Italy, France, Britain and the U.S.
Founded in 1908 by Giovanni Battista Caproni, the Caproni company was called the Società Caproni e Comitti, based in Taliedo, Italy – outside of Milan.
Caproni was actually the first builder of an Italian aeroplane in 1911.
Thus ended the history lesson.
I really just wanted to show off a cool poster and not have to write a lot today – and then I realized it wasn’t just a poster… it was a history lesson. Two hours later, here we are.