More Rolling Block questions

This is the RB I bought over the weekend..it is a 7mm SM example, and is, from what I can figure out a no. 5 specimen. While trying to find a mainspring and extractor for it (I'm not sure if it needs a firing pin spring either) I discovered there are three models of the no. 5..the 1897, the 1902, and the 1910. I have been trying to find exactly which model I have so that I can get the right parts for it. Problem is, this doesn't appear to be any of those models. The last patent date on the tang is 1874. I have tried to get a clear picture of it here, but it's pretty worn. But I'm almost certain that's 1874, and as I understand it, the last year on the tang should be the model.
This is actually my first RB, and boy are there a lot of variants. I'm thinking this may be one that went to Uruguay or another South American country. BTW, pitting on the barrel, but surprisingly the bore is absolutely pristine.

Looks like you have an 1897 version of the No. 5. This is the apparently the only version of the No. 5 with a screw to limit the movement of the extractor on the left side of the action. This screw is visible in your first photo at the top of the action.

Bill

Some years ago, I found a Remington Rolling Block in 7mm (M1902) in a local gun shop.
The bore was bad and the barrel was cut, also the fore-end was cut and a large H was
carved in the stock. I was able to buy it at a very reduced price.

I found a Numrich 45-70 barrel (they also had 444 Marlin cal too) which was not that easy to install, modified the extractor and found repro wood. As I had 45-70 tong tools it was easy to reload blackpowder cartridges. A drop tube is best to get the most black powder into your case.

I made a large tang sight and did not mark the scale until I fired the 500 gr lead bullets at 100 yards from a rest. When these bullet would hit the four inch metal plate I marked the sight. One problem with the rolling block is the trigger pull but I was able to correct that in another project. Even if the 7mm barrel was good, there was a lot of variations in the chamber dimensions during the early pre WW1 period and finding surplus 7mm is difficultAttachment 94189Attachment 94190

I must admit..I'm more confused than ever on this thing. I just fished out what was left of the extractor, and from what I'm seeing, this is described as a no. 1 bar extractor.

One more thing. The front sight is different from most 7mm RBs I've seen. Looked it up, and its described as a model 1896 No. 5. Would that be correct?