Does anyone know what the horns in this picture are?

http://yfrog.com/59hornsj

There are two things that called my attention, the strange shape of the lead tube in the horn to the left and the ring (for the thumb?) in the one to the right.

The guy in the maroon shirt looks like he is playing a Cecilio single F Horn, probably a 3 series. The girl with the white top and blue cover shirt looks like an Amati Single F Horn, AHR-321.


<Added>

Oppps, I meant a 2 series on the Cecilio single F.

Wow! Thanks a lot for that info! I'd googled for all types of horn, but hadn't found them. You seem to know everything about every horn. You da man!

(in sarcastic tone) Yeah, I'm da man. I know everything about every kind of horn - - - NOT. But thanks for thinking I do.