Herb,
I have one like that too. It is a DWM magazine, wood bottom with a military serial number. It is blued, but it must be salt-blue as it is blue inside as well. The mag-light shows the finish to be old.
I suspect mine was blued sometime after manufacture, why is anybody's guess. Check the inside of yours, if it is blued it is certainly later work.
--Dwight
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