? on USFA Henry Nettleton model

Photos of it is usually a necessity to determine Parts origin. Serial sequence is really not a reliable way to tell because USFA jumped around so much and there was no set serial Parts switchover. If the gun has a longer black 2 piece “lift top” type black box with a factory label of later production and its for sure factory original box and labeled to the gun, then USA Parts. If hinged lid black box white label, gotta see the gun. If hinged lid black box with blue/white label , then Uberti Parts. This is just a general rule of thumb if you have the box.
Still best to judge by the shape of certain parts of the gun.

Thank you both!

As I recall, USFA offered to make a person a duplicate of their original Cavalry SAA using the same serial number. Since the gun you refer to has a serial number that would put it in the Colt Henry Nettleton range, I suspect that is what was done by USFA for someone.