How can you confirm that the Factory cut it?
In over 50 years of collecting and dealing, I have never seen a barrel which has a forged front sight base cut and the sight base reattached by the Factory.

Generally, collectors are seeking guns in the configuration they shipped in. In other words, original condition.
Sure, a gun sent back to the Factory to be engraved is a Factory engraved gun. But, it was not originally engraved. There is a difference.

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Regards,
Lee Jarrett