I have only owned one Colt NS in .455, and it w chambered for the Mk II round, as .45ACP could be fired in it because the chambers were shorter than those of a .455 S&W. I bought that Colt from Navy Arms at a gun show in Columbia, SC in 1965 for 22 d0llars, and later traded it off when I discovered that the extractor was to thin to be converted to .45ACP by facing off the rear of the cylinder.
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Tom
1560
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