Ah Yes. I have one that is identical, although whilst I do not have bases for it the back end of the scope bears a mounting plate (for the want of a better description) that is contoured to fit an Lee Enfield or Lee Metford rifle body. It is not dated but I have assumed that it is probably around the 1890's to 1900 era. Busy day today but I'll try & get some photo's of it later.