Duplicate Serial Numbers: Colt manufactured 60,000 pistols in the Ithaca serial number range (804), 41,696 in the Remington Rand serial number range (900), and 4,171 in the US&S serial number range (10896). Ithaca and Remington Rands where not manufactured or shipped in numerical order. I have the opportunity the buy an old 1911 made by Ithaca. The slide is a great fit. It does not rattle like the ones I was around in the military, and the rifling looks good also. I don't have the serial number. I was wondering how much it could be worth before putting down money.