Welcome to the forum. Your 1937 Mauser Luger is a first variation as it has straw colored small parts and rust bluing. During later 1937 production, Mauser began using a hot bath chemical bluing and all parts were blued except the safety bar that blocks the sear bar when engaged.
The early first variation 1937 Lugers are valued more than the second variation, all else being equal. Fewer of them were made. Also, look under the numbers on the front of the frame for a letter. That's called a "suffix letter" and is part of the serial number.
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