I got this 1920 Colt at a pawn shop with incorrect grips.
Some forum tells me those are Sambar grips. Don't beat those up.
I got this 1948 Colt at a pawn shop with incorrect grips.
Some forum tells me those are Python grips and don't beat them up. So I bought some old plastic grips on Ebay for $5 +$6 shipping. Then some forum tells me that those are Franzite grips, don't beat those up.