to bad only such pic survive

"A RARE SIDE-OPENING PATENT 12-BORE HAMMERLESS GUN BY F. von DREYSE (SMMERDA), NO. 33290
The pull-back rotary-underlever opening action with initial forward-sliding barrel action, the action face with double bosses, backlocks, cocking-indicators, best bold foliate-scroll engraving, lever-safety, figured stock with semi-pistolgrip and butt-plate, sling-swivels, the browned twist barrels with game-rib and silver-inlaid maker's signature
Weight 7lb. 1oz., 14in. pull, 30in. barrels, approx. I.C. (relieved) and .5/8 choke, 2in. chambers, Black Powder proof"

http://www.christies.com/lotFinder/lot_details.aspx?intObjectID=1374655

you see its a very late made gun with its 33290 number for the common 12 ga paper cartridge with complete different looks but the familar forward sliding barrel action