mc has asked me to post some pictures for him. His Greener A&D 12 bore BLNE no. 19119 also dates from 1878 but has some interesting differences from mine.
Note early pyramidical cocking levers, very low A&D patent use number and Greener Elephant trade mark.
His bears J. Brazier stamp on underside of action. Brazier appear to have made the action and no doubt the lock work for Greener.
Greener made the barrels , note their elephant trade marks near the Birmingham Proof marks.
Arcaded fences with Greener Treble Wedge Fast cross bolt.
And a glorious bit of walnut