Hello,
The rifle has the Spanish crown and 1876, everything appears original as best I can tell.
I see no "R" near the receiver/barrel junction, so assume it is still in the original .43 Spanish caliber. Action is tight, with a very crisp hammer, barrel has strong rifling. There is some pitting on the the exterior of the barrel in several places. Please see photo's to help with the evaluation. Your help with the rifles value in USD is appreciated, thank you.
http://www.gunvaluesboard.com/images...782resized.jpg
http://www.gunvaluesboard.com/images...SC_9803res.jpg
http://www.gunvaluesboard.com/images...SC_9796res.jpg
http://www.gunvaluesboard.com/images...SC_9784res.jpg
http://www.gunvaluesboard.com/images...SC_9785res.jpg
http://www.gunvaluesboard.com/images...SC_9786res.jpg
http://www.gunvaluesboard.com/images...SC_9787res.jpg
http://www.gunvaluesboard.com/images...SC_9800res.jpg
http://www.gunvaluesboard.com/images...SC_9798res.jpg