Do tell, I'm bidding on it.
The first rule of eBay Club is that you know what you're bidding on before you bid on it
.
OK, the reasons against Julius Keilwerth manufacture:
* "05535" is not a JK serial number. You could make the argument that someone just misread the number, but that other ad has a s/n of 05529.
* No "Best in the World" trademark stamp.
* No "Made in Germany" stamp.
* Last time JK used that kind of G# cluster was a loooong time ago. And it wasn't exactly like that, even then.
I think Amati because a) JK and Amati have had a very long relationship and b)
this Student horn is very clearly a stencil of an Amati Classic Super (or "Super Classic," if you prefer) -- you can tell by the keyguards. I think the ones in those eBay ads are just newer Amatis.
It's definitely
possible it's another maker. I just don't think the maker's JK.
Anyhow,
the first ad also has a couple nice-looking mouthpieces. Hey, a Berg Larsen lists for over $200, new. The case looks good, too. At this point, you're going to get value, one way or another.