You have an 1879 Argentine model. (You need to Login or Register to view media files and links)
Most of these were arsenal refinished whether they needed it or not - most, probably not. I had one and paid about the same. Mine - and maybe most - had a long throat. I had Bernie Rowles of Old West Bullet Molds in Colorado make me a custom mold for it that best suited the chamber/throat.

That $800 is about the going price for them, I think.   I got several from Ye Olde Hunter in Alexandria VA about then.   Remington BP ammo was $1 for a box of 25.

CHRIS
RGChristensen

Seeing them in good shape is not unusual, as others have mentioned, they're often arsenal refinished. But I notice that every one I see refinished is completely blued, where I believe they were casehardened receivers originally. 
I got lucky and bought one about 5 years ago for $175 at a local gun show. Before I got it home my traveling partner talked me out of it for "double your money", so he still has it. At least it's in good hands.

As others have stated, if the action is blued, then it's one of the refinished ones. If the markings on the action are still nice and sharp instead of polished nearly to oblivion, then yours is nicer than the usual run of the mill ones and price is decent.  If yours still has a color casehardened receiver and niter blued hammer and breechblock, that's original finish, and you did REAL GOOD!! 

I got mine from Don Muno who with his brother had the largest collection of Rolling Blocks in the US.  Their father worked for Remington.  Paid $700 for a complete factory rehab ...
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Plus have 100 Connecticut Cartridge Co 43 Spanish headstamp cartridges that I use to reload from using the NEI 439186-370 bullet ... 72gr FFg and 5gr 4759

Thank you all for your comments and information.  One question I do have concerns the stamping "Modello Argentino. 1879 E.N." stamped on the rear of the barrel shown above and on the link you so kingly gave me.  Mine does not have the above marking on the rear of the barrel or the witness marks at the barrel/receiver junction, but otherwise appears identical including the B stamped on the side of the barrel. Also, mine has the case hardening lightly showing through the blueing on the receiver (not that makes a difference).

Were some Argentine RB's not stamped?

Quote:

All contract rifles to Argentina were stamped.
Remington military contracts were sold to many countries with or without markings.  This rifle is the Argentine military contract - Modelo Argentino 1879 E.N. (Ejercito Nacional, i.e. National Army) Other Argentine's were marked Modelo Argentino 1879 E.P. (National Police)
When the 1902 RRB 7mm Mauser rifles were designed, Argentina shipped all their 43 Spanish back and contracted for the 1902's