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I stumbled on this today while doing some research. It was described as (and looks) original. It was made by Gautrot Brevetc is Paris. The leadpipe swivels so it works as an OTS or as an upright horn.

I've never seen a convertible OTS horn. Also, I noticed that it has standard piston valves instead of rotors or berliner valves. Do any of you know anything about this horn or horns like this? Any ideas of when it might have been made?

Thanks!

HI-
c. 1865-1875. Different pipes for marching (OTS) and for concert settings (upright).
Regards-
mark

I have a Stewart replica OTS EEb tuba - but it has rotary valves. The position of those piston valves would make it darned awkward to play - in either configuration!

The top view reminds me of a modern folded marching Euphonium (with a bottom bow and bell added on.) A closer view of the details would be interesting to see.

(not saying it is a replica / Frankenhorn - just an interesting similarity!)