I have a Remington Rand, serial number 1,409,5xx. It has a barrel marked "45 Auto" over "7791193" over "85" on the top of the chamber and visible in the center of the ejection port. The bore is chrome plated. Can some one tell me the origin of this barrel?

Also, I would like to know how an original barrel for this Remington Rand would be marked and if any are available for purchase.
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