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The pictures in Clawson's book seem to match up with an early Remington Rand mainspring housing.

I think the other two are early Colt and US&S but not sure. Email me direct to bdlltd@bellsouth.net...

Hi Bob,

According to Charles Clawson's book, it's a Springfield Armory barrel produced prior to 1943 when they added the Heat Lot number above the "S" and "P" stamps. Guessing a replacement...