Hi Matej, and welcome to the forum.
The frame from your pistol was made by Mauser after 1937. Serial number "7666b". A Luger with this serial number on the frame was made by Mauser in each of the years 1938, 1940 and 1942.
The refinish appears similar to the dipped finish used by the Russians and Eastern Block (like the German DDR) when they reworked pistols, but they usually marked them (often a large "X" on the left of the receiver.
Marc
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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