I looked all over the back and brace with a magnifying glass for identifying marks but found none, unfortunately.
As you will see from the posts above, I have taken out the brace. I will probably replace it with bracing similar to this I am using on my Lott copy build below.
Is this similar to the bracing Jeff did on your Claudot?
There is a bit of work to be done re-shaping the back lower bout on this french bass. over the years it has sunken inwards and put the rest of the back out of shape. I want to restore to flat or preferably a slight outward dishing. This may take some time! I have to redo the centre seam first.