TubeNet

Anyone know what this is? The valve layout looks like a helicon:

http://grandisland.craigslist.org/msg/5355930222.html

Buescher?

I'm going to guess Amati. Similar one from horn-u-copia:


Part of the leadpipe's missing, I'm just guessing that what's left matches the craigslist sousaphone, where the leadpipe appears to loop around the valves to come back to the 1st.