Read the story here:

http://www.battleofthebulgememories.be/stories26/32-battle-of-the-bulge-us-army/659-parkers-crossroads.html

Parker's Cross Roads  2

Parker's Cross Roads, Baraque de Fraiture,province of Luxembourg,Belgium this weekend.Battle of the Bulge

Parker's Cross Roads

Nazi belt buckle gun. Invented by Louis Marquis and received a patent for a similar design in 1935. Koppelschloßpistole (belt buckle pistol) was developed by the SS-Waffenakademie at Brünn (Brno). Тhere were at least two versions for wartime use: a 2 barrel design in 7.65mm and a 4 barrel design in .22 cal or 5.6mm. The belt was intended to be issued to agents as a last-ditch self-defense weapon to avoid capture. Manufactured 12 models. But in private collections there are buckles with numbers 155 and 158.
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https://www.facebook.com/historicalweaponology/photos/pcb.1402744956691165/1402744806691180/?type=3&theater

taken from fb/Historical weapons research journal