ChristopherB,
Kerner was a known German gunmaker. There were several variations of 450s, it would be important to know which variation it is. The different variations differ mostly in case length. If the Gun is a 1930s German Gun, the case length should be shown in the proofmarks, together with the bore(not groove or bullet)diameter, both in mm. If pre 1912, case length will not be shown, and bore diameter will be shown in gauge measurement(maybe 51,05). It would help if you could post photos of all markings. A crown over E, if present, designates Express proof.The 450#2 was not popular in Germany and has a larger head diameter.
Mike
Last edited by Der Ami; 03/22/18 04:45 PM.
