Got this a few time ago, and it had been already shown in another forum.
But it´s nice and not very common.
Sn is 313 o matching, scabbard from Dürkopp, SG from Eickhorn.
I was told that the frog is from Otto Jähnke, Berlin.
nice piece, with old sources/replacement Durkopp scabbard, not dated mostly finished by Eickhorn, what is on ball finial for proof? the AK frog looks nice. b.r.Andy
I assume it was declared by Sleepwalker a german expert on frogs, he has probably a similar production piece with codes, comparable pieces in his collection.b.r.Andy