George, you should see a halo on a barrel serial number stamped after the barrel was rust blued.
1937, in particular, was a time of transition as the factory shifted over to salt blued guns. The shift was gradual, and could possibly have mixed parts from different processes.
I'm not near my reference books right now, so can't verify things. What is the serial number and chamber date?
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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