In addition to the above...
Martini-Henrys languished unwanted in sheds, armouries and other obscure places across Britain and the former empire until the film "Zulu" was made in the 1960s.
They became quite sought after following that moment.
It's little brother, the BSA martini model 4b .310 followed as a natty little companion piece.
For what they are (simply built, no-nonsense miltary rifles and trainers) they have become very valuable.
RG