First generation Colt SAA .45 with one piece Rosewood grips...
Nice wood, Shrap.
Did you do the fitting?
With rich rosewood, it's often so oily most finishes have problems drying. I found a good soaking in acetone sucks a lot of that oil out of the wood, making it easier to finish.
With the burl rosewood pictured earlier, I did that and noted the acetone took the black background off the Ruger medallion. That's OK, as it looks good on the SS ROA.
I used Custom Pro oil, a tung oil/urethane product that Brownells sells. It's harder and tougher than Tru-Oil.
DF