Hello, and welcome to the forum!
Be sure to take a look at the FAQs published here...
1937 was a particularly interesting year for Lugers at Mauser, where they shifted from Rust Blued Lugers with strawed parts to salt blued pistols. Your's looks like one made later that year.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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