I still must look into this but I think it is the U-83. The boat has the olympic rings of the 1936 crew which OL Wörishofer was a member of. The emblem above it is less clear but if you look very close the lighter part does look like a viking ship, Which was the boats symbol. This boat did operate in the Med. and several of these boats did receive the GEMA set and the type II turm conversion , which I do think the u-83 did have( the tower conversion that is ). But when I get more time I will look into this further .