Hello Tom,
Welcome to the Forum. It is always a pleasure to see members from the Eastern European countries join up. Hungary has an interesting history and local knowlegde is always welcomed (including the necessary language skills
).
Your 1936 Mauser looks like it has been refinished at some point in time, at least partially. It is possible that some work was done it. The small proof mark at the left side of the receiver is a Hungarian repeat/repair proof, the top an bottom part of the stamp (an R with shield) are missing. I expect that the gun was actually repaired and reproofed in Hungary itself.
If only it could talk