TL;DR
Bought it for A$200. It's a terrific horn. In superb condition, a very small ding in the bell, valves are smooth and fast. I had a quick blow, it sounds lovely, blows freely and was just 'fun'.
The horn in question:
Full story:
Went to have a look, everything seemed great. Valves smooth, slides clean and moving well. Inserted the mouthpiece, blew - and hit a wall. Bugger. Looks like this isn't a bargain anymore. Anyway, pulled the valves out, and they were completely mis-aligned. Did a rough reinsertion, and got sound. OK not much to lose, offered $200 which he took.
On the way home, dropped into Ozwinds to buy a Yamaha 14B4 MPC (advice from teacher), and showed the salesperson the horn. He thought the black nylon collars had gone missing, which was why the valves could be turned even when inserted.
Mmmm.
Got it home with a torch. Realised there's a tiny notch, and so long as you line it up properly with the keyway in the valve housing - perfect. Whew.
Here's the valve guide:
Put on a MPC, and just wow.
Contact the Seller. This is a Holton/Leblanc T602 trumpet. It includes a hardshell case, cleaning kit, mute and original pamphlets and care instructions. Jun 14, 2004 - It seems to me that Holton is a well-kept secret. They have the Maynard Line which is a great horn at a very reasonable price. The MF Admiral is.