I am giving my best shot here using my son's eyes. LOL
Lockplate engraved says Maubengel Manuf. Imp.. The "L" or "EL" at the end could be a flair mark. E could be an i.
Possibilities are:
Maubengel
Maubingel
Maubenge
Maubinge
Maubeng
Maubing
Funny, One gun has smaller cursive letters and words than the other. Small enough so One could read the makers name with the flint mechanism installed. The larger lettered gun's letters and words are engraved in the old portion of the lockplate were the flint mechanism was. Both styles of writing are the same. Odd.
JD