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mc,
I have just acquired this very early W.W. Greener A&D boxlock non ejector and its serial number 19886 indicates it was built in 1878. It has the early style round cocking levers.
Sadly it has been sleeved (it bears the early SLEEVED marks externally at the breeches). The original black powder marks have disappeared with the original barrels and it appears to have been nitro proofed in 1939 but then sleeved in 1961.
I have taken the bottom plate off and cannot find an action maker’s mark. Whereabouts on your 2 is the Brazier marking?