Twaits,
That is very interesting but it does not compare to any factory work I have seen. From your early pictures I thought it may have been. Still it is a two barrel set and only one of three I have seen ( Med. Frame Pocket Model ) in the last 25 years messing with Merwins.

rhmc24
Nice 2nd Model SA Frontier Army in .44 M&H you have there. Looks very honest. The first model has two small screws just above the trigger on the left of frame where your 2nd model has one. Like the grips also!! Looks like a 3000.00 to 3800.00 with the amount of finish remaining. The grips help about 400.00 of that!!