F helicon

[Donn]

http://www.ebay.com/itm/131443549926

I had one of these for a while - from the same seller, too. Mine was much more beat up, but it was a pretty decent instrument for all that. The shape rests on you with little or no tendency to pitch forward or back, and there's more room and a more comfortable wrist position than their Eb, thanks to the false wrap. Sounds like a tuba (not a big euphonium.)

This one has a sad leadpipe, though. Looks like it's broken, I guess not cheap to fix.

http://www.ebay.com/itm/181755881133

I guess this is the same thing, but I'd say the valve linkage has been updated? Perhaps when it went into Lidl for "general reconstruction."