Sure is an oddball. Looks like a VZ24 stock with the bolt through the pistol grip and finger grooves but the bolt cutout looks weird. If it were prewar Czech it would have an E37 or E some other two digit year which denotes year of acceptance by the Czech army. The Dot marked barrel is WW2 Germanicon/Czech manufacture and the bottom metal is stamped with the large trigger guard which is a post war Czech feature. And the receiver ring is scrubbed? I would guess a post war refurb by Czechoslovakiaicon but who knows? Maybe something someone built from spare parts, very possible due to the straight bolt which wasn't used by the Czechs post war. Probably a great shooter though.