This is a refinish I did several years ago using Belgian Blue. The grip I've had forever & no recall of when, or who. The inside shows where something has been scraped away. Outside was in good condition but badly worn to where no checkering remained & much of the area could only see lines that were once the bottom of checkering. I first made a little graver from a mini triangle file & scored lines where the markings were & deepened what checkering was left.
In the process it became obvious that it was originally checkered by a single cutter with the line spacing by eyeball. In the original grip pix it is plainly seen that the spacings vary. I tried to follow the original as best I could till I had it completely cross-hatched. Then I deepened the lines with a modern solo checkering cutter to produce checkering. It's not great but looks good on the gun.
The grips are a tad small for the grip frame, possibly due shrinkage over time. The walnut seemed a bit spongy so I gave a fine coat of water based varnish to protect from handling damage. I'm wondering about checkering back in the day --- this done obviously without the modern double tool with one sharp for cutting & the other smooth as a guide to keep line spacing uniform. This is my only S&W example but I have several on Colt 1905 automatics.
The gun s/n is 49xx I assume 1880s --- Taking it to LGS tomorrow to put on sale ---