1933 KI

Need some help guys. Anyone knowledgeable on a 1933 KI? Have a nice one, matching serials and Simson proofed. Mag is not matched but proofed by Simson. My question is the rear toggle axle is stamped with a number that does not match the rest of the gun. Axles were stamped about that time and '33's were remade/reworked from toggle assemblies of DWM, Erfurt & Mauser. Could this numbered pin be part of the original serial number that went with the toggle assembly used for the original gun even though the center toggle was renumbered to match the rest of the newly assembled gun. Any ideas out there?