Petre Devos
From The Big Bang Theory Wiki
A Flemish beer made in the 1930s in the village of Audenaerde (Dutch: Oudenaarde) in Belgium. 
The guys have an advertising poster for this beer on the wall in the kitchen in their apartment. The futuristic art deco font used for advertising this beer was truly ahead of its time, looking more like something from the "mod" 1960s than from the 30s, and it was the inspiration for a font used today known as Petre Devos.
