Bought this some years ago. I looked up the serial number and it says shipped in 1990, but it didn't say anything about being a Bisley. The yellow box says it's a Bisley, but there is no serial number on the box so I don't know if it's original to the gun. S/N is 86-21xxx. Anyway to know if it's an original Bisley versus someone swapping grip frames? Thanks.