Allan:
Interesting find on the lefthanded Meffert. Yes I'd say it is a Meffert made for the trade. If the strikers, coil springs & cocking indicators are housed in a horizontal metal block attached to the top tang, then without a doubt it is a Meffert. From the pics I can't tell how the striker block would be attached. Mine has a screw or two that holds it to the top tang. Is there a "Nitro" stamp on the scattergun tubes? It may date as early as 1910 if the "Nitro" stamps aren't present and I think Brno Meffert was the owner of Imm. Meffert by 1920 so I don't know what happened to ole Ernst Richard Meffert. It may be another Model in addition to the Treff version.

Kind Regards,

Raimey
rse