Just found this forum - excellent information source.
The image shows a .22 rimfire revolver engraved LIPOSI LD 1873 ELEY'S CARTRIDGE RIM-FIRE. The spur has been broken off the hammer but, apart from the deterioration of the surface, the weapon is still functional.
I believe it belonged to my Great Grandfather, in the UK, but there's no other family knowledge of it.
Anyone have any thoughts on this please?