KR,
I think your point is particularly true when guns other than Parkers are involved or when absolute replication is the not the goal.

I do have a 190x Parker that Turnbull did and the colors match the hidden colors of another Parker produced within a couple years of that one. Really a great job of replication. I don't think I've seen as close a replication from any other smiths, but lets face it, I haven't seen every gunsmiths attempt either.