We wrote a book dedicated to the guitars made in Paris between 1650 and 1950, from Voboam to Bouchet, which was published in 2007, and now the second volume dedicated to guitars same period (less or more!) made in Mirecourt (Vosges) and other french provincies! preview I hope for next october..
Thanks for the new photos, it is very interesting… You have now a rare and valuable guitar, i hope you will send photos when it will be restored. If you need some infos about Grobert, please mail us… Grobert has a particular place in the guitar making…

and i forgot : Thank you for the photos…
Françoise

and probably you will find another brand under the brace under the soundhole on the other side. With a mirror and a light (led) you can see it. I hope!
I add (if i can) a photo for you
All the best
Françoise