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I rebuilt a three-rotor version of one of these cute little horns a while back:



It's indeed Czech... as 'Bloke' suggested. Mine was made by Jerzy Krywalski. The name plate was probably removed from the sellers horn during a repair. (or maybe it fell off as some do!)

Scroll down toward the bottom of my 'projects' page:

http://members.evansville.net/dschultz/projects.htm

Paul M wrote:How do these horns play? I've read they're very hard to hold. I'm interested in this because I'd like to play euphonium again, but can only spend about 500 on it.

I think they are OK to play. I prefer front-action and rotary horns, anyway... so I am more than a little biased.