For lots ‘o info on old military bolt action rifles including Martini-Henrys, check here, especially the forum section:
http://www.surplusrifle.com/index.asp
Talk about a good movie plot. That rifle was probably carried by a British soldier from the UK to India to Afghanistan, then changed sides in battle. It was probably fired against the British, Indians, other Afghans, Soviets, the Northern Alliance and finally Americans. I’d bet it was buried under a few huts in between. Too bad it’s in such poor shape and probably got destroyed by our military. It deserves a good cleaning and retirement over a mantle somewhere.