Gautrot Breveté - this page talks about a French horn, but gives some info about markings and provenance.
And some info from
http://www.angelfire.com/music2/thec...turers_c.html: Quote:
Couesnon
(Paris 1827-present)
This firm has had a long distinguished history and it is the intention of the writer of this document to provide the historical background necessary to understand the place from which today’s company came. Briefly, the company began in 1827 with GUICHARD, in c1845 it became GAUTROT AÎNÉ, and finally in 1883, we see COUESNON.
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I think you'd have to post detailed pictures for any knowledgeable person here to give you a ballpark figure. For a real evaluation of course you would need to pay someone for his/her time. :)