French bass ID

[Vince Jesse]

Hi. Someone brought this bass to me for some minor work. Here are some measurements:

lower bout width 25.5"
upper bout width 20.5"
rib depth not including plates lower bout 7 7/8"
rib depth at neck block 7 7/8"
length of back from bottom of bass to top of button 45 3/4"
string length 42 3/8"

no "break" in the flat back.

Very long scroll and pegpox.

Three back braces.

Top looks heavily wooded.

The back has a center seam inlay and the varnish over this must have deteriorated, giving the varnish on the back that look.

There is a faint stamp in the back that's impossible to make out and a partial label that says "Bonne..." The stamp looks like it's from a general musical instrument shop. Pianos, organs, etc.

Anyone have some insight into this bass? It sounds great.