Obelix, I am currently concentrating on Selmer horns. While I have an interest in other brands, my work on Selmer will take all my available time for the next decade or twoAre you researching Selmers only ? I also have a Gautrot-Marquet Baritone, which I won't restore, and is for a dispaly only.
The Gautrot-Marquet alliance existed for about 10 years between 1865 and 1875. The horn looks really old.