Isaac BLISSET
Isaac BLISSET, London/GB, known 1822-1845, 1822-38 Leadenhallstreet 60, 1839-44 Leadenhallstreet 70, 1845 Leadenhallstreet 69.
Looks like he loved moving. The "V" and "GP" crowned is the London proof and view mark after the law of 1887, the "13" is the calibre of the smooth barrel. So this makes clear that the gun was made after 1887.
Udo (Germany)