Anybody eard of the maker/brand?

Friend has a bunch of German war era stuff he wants to get rid of and has knife I may buy. Blade says Hugo Koller Solingen Germany. Blade is pretty untouch (hasn't been put to stone and wore down to nothing)with stag handles, lock blade the lock spring appears to be stainless steel.Knife appears to be 90% condition.

Hugo Koller mass produced pocket knives for the European market after WWI and were bought out by Puma in 1991. The stainless steel models were mostly in the late 60's and on. Decent knives but not very collectible. A knife in good condition $30-$50 ONLY IF it has the trademark eagle. (looks kinda like a Nazi eagle). If it doesn't have an eagle, don't bother.