A very nice Sauer Drilling, Adam! If I read the markings correctly it was proofed in 1957. After WWII Sauer started making Drillings in 1952, the first model being called 53S; I have a specimen proofed in September 1953. In 1956 Sauer introduced a Drilling with hammered rifle barrel, model 3000. My model 53S looks just like yours (except engraving and condition

) so I'm not sure if your Sauer is a late model 53S, or an early model 3000 (I have also a model 3000, but a later specimen with simpler frame lines - not as nice IMHO). I bought my model 53S recently in Germany for about $1600; same calibers as yours, but with a Nickel 1-4x scope in claw mounts.
With kind regards,
Jani