This is it.
Pull down trigger
N with crown above it (barrel, frame and cylinder)
5o on swing arm under the front of the barrel
GK on the grip
remove the grips, there might be a serial number underneath
No S/N just the same 5o no one corner thats on the swing arm.
There was a German firm Geo Kaunas or something like that i might be missing the spelling, but they did make a 6.35 hammer-less.. It was referred to as a "baby" hammer-less..
Wonderful condition.. This might qualify for auction house intrest