Not sure which section grip questions are the best fit but this is probably good as any.
As an entry level appreciator of old school grip making I can flounder easily. While not Roper/ Sanderson level they are not a freshman level maker either. Do they ring any bells as far as who may have made them.

First one is for a Colt E/I frame . No jig pin holes that I can see, very nice checkering.



Second is for S&W Nframe . Possible round jig holes on top. Probably a refinish with glossy stuff.
I will probably strip and oil finish.



And a view of both , from the rear.



Any and all knowledge or guesstimates welcomed, Thanks.

No knowledge here, but I will say those are both very nice grips.

They don't look familiar as far as a maker.

I think the maker of the second pair was probably more experienced with inletting work. Or at least the inletting work shows better skill and the use of sharp chisels and the use of scrapers to refine the surfaces.
Those nice square interior 90* corners don't come from a machine w/a round bit.
No tear-outs in the inletting which is common in that fancy wood. No marks on the inner top edges where they used that edge as a fulcrum for the chisel as they worked along.

I'd bet the outside workmanship on that second pair was much better, more up to par with the interior skill before someone refinished them and gave the checkering and borders a quick going over.

I think what you are seeing as 'jig pin holes' on the right panel are shallow clearance countersink cuts for the S&W side plate screws.

With careful work that second pair will refinish and rechecker nicely. There's some very nice wood under the heavy refinish.
With the checkering staightened out and borders evenly re-cut and then a couple coats of thin finish brushed into that, the grain will really pop out nicely.

Pistol grips especially revolver grips can be very difficult to checker. They would seem to be a nice place to begin and practice to gain skill. But the small areas constrained by sharp inner angles and rounded surfaces can make a simple job very difficult. Once those very short lines start to go off coarse, you're stuck.
Plain flat semi auto grips are a better practice area if there is to be one. But you still get into small confines.

Those S&W ones look an awful lot like Herrett Shooting Masters. I have two sets for k frames. Basically for NRA Bullseye shooting, back when revolvers were king. That's why you often see them for K frames (K22 and K38 Masterpieces, etc.) but they were made for any frame.

Those are very nice grips. If I were to make a pair, they would probably consist of duct tape. If I really wanted to make them snazzy, I'd use black and grey tape! Seriously, those are nice.

Duct tape comes in purple now, too, donchano!!!! Very pretty.....

Those are REALLY nice looking stocks - no duct tape needed!

__________________
Come and take it!!