chatGPT gave the following advice.
What you can do if you want to identify your .22 Mauser
Gather all the markings: manufacturer’s name or code, model number or designation, proof marks, country of origin, any prefix or suffix on the serial number.
Use existing reference books, websites or forums specialising in Mauser firearms to cross-check serial ranges, model variants, export contracts.
Contact specialised archivists or research services (for example the Paul Mauser Archive mentioned) and send full details (photos, markings, serial) to request a certificate or verification.
Consider consulting a qualified firearms historian or licensing expert if your country requires proof of provenance or registration (especially given local laws for historic firearms).