I was looking at a custom shop gun, basically new in the CS box, that had oversize grips. They were the 1860 Army pattern, so there were limited CS production of oversized grips. Whether this one qualifies or not would require a Colt letter to confirm I would think.
Also, the seller said "It has beautiful stag grips with gold colt logos."
I didn't see any Colt "Logos" on the grips... may be my old eyes missed them??? Bob Best