Here is the entire online photo gallery of this Greener Martini: https://flic.kr/s/aHskDhEMnQ
I inherited this classic shotgun from my father: A 12 gauge single barrel Martini Henry Action Greener GP (General Purpose) Shotgun in very good condition.
I am not quite sure which variant it is, but I believe it is one of the Carbine Mark variants as seen here: http://www.martinihenry.com/mycollection.html
The markings/text on the shotgun are as follows: BV BP 12c 2 3/4 CHOKE NP NITRO PROOF 1 1/4 oz W.W. GREENER MAKER BIRMINGHAM ENGLAND GREENER'S GP GUN
Please feel free to ask any questions regarding this shotgun. Selling for $250. Price includes shipping with insurance and confirmation. US Postal Money Order only please.