A BSA bolt-action Model 2 single shot sporting rifle made as a takedown rifle in a travelling case by Alexander Martin of Glasgow, Scotland. It is complete with its ultra-rare BSA tang sight, all its accessories, including a tin of 'BoreBright' cleaning paste, and was made for a young man sometime in 1912. He having died in WW1, it passed to his younger brother, who passed it on to HIS son, from whom I obtained it in 1992.
As far as BSA records go, it is unique.