Original U.S. WWI US Army Air Service Named Observation Balloon Pilot Uniform Set - Lieutenant A. T. Wineow, First Army Air Service MG 08-15 Maxim It reads around the top

It reads around the top the stein:

the answer is in the position of the adjustment buckle of the shoulder strap

brass eagle belt plate

with 4 being clear

southern Denmark and parts of Holland

Original U.S. WWI US Army Air Service Named Observation Balloon Pilot Uniform Set - Lieutenant A. T. Wineow, First Army Air Service MG 08-15 Maxim It reads around the topOriginal Items: Only One Set Available. An observation balloon is a type of balloon that is employed as an aerial platform for intelligence gathering and artillery spotting. Use of observation balloons began during the French Revolutionary Wars, reaching their zenith during World War I, and they continue in limited use today. Synonyms include espionage balloon, reconnaissance balloon, or surveillance balloon. World War I was the high point for the