It's also worth remembering that tailboard cameras were in continuous production up until the early 1960's in the UK from Watson's, Gandolfi may have made the odd few since then as well.
There are a few makes that fetch very high prices, but the camera etc needs to be almost mint.
As said above you really need help from France, most UK cameras use similar, or identical brass fittings bought in from specialist brass companies, I've a couple of 1890's catalogues, and it's much the same in the US where you see the same Brass work on competitors cameras.
Interestingly your camera's carrying handle looks like a drawer handle, often camera woodwork was made by cabinet makers.
Ian