Please help to determine the French lens maker.

[Two23]

What decade would this likely be from? I'm guessing 1850s?


Kent in SD

[Steven Tribe]

Probably is (1850's), but VM has the usual "holes" as with most foreign makers!
It could be that the lens is complete as it was when it was sold and that the modifying central bayonet lenses were extras that could be bought later. Or, perhaps, the very first casket set? Jamin had something similar - as demonstrated by Eddie recently.