I think what you see that is nickel looking Terry is actually the silvering out of the case colors on the frame underneath the recoil shield on the left hand side of the frame.One picture shows a hint of remaining nickel. In the condition I see, I would think the gun and grips are worth in the $2000+ range.
Here are some pictures that I have archived of very similar style of carvings on the heads. No idea who did them but I believe from looking at several guns with these type of grips on them that you can figure from the 1890's until the early 1900's is the right vintage of manf. The OP's 32-20 was somewhat late for these grips and they fit it okay but not extra well fitting.COLTSIXGUN was there an artist(s) who were know for their carving Pearl grips during that era?
I imagine they were affiliated with the larger wholesalers?