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Looks like a good deal, if valves aren't worn out etc. Nice that it has a receiver bit, like a sousaphone, that's a huge step forward for a player who isn't so lucky as to be an exact physical match - but possibly small shank? That Marcinkiewicz mouthpiece appears to be just barely inserted.

Isn't that John Van Houten, Los Angeles freelancer and renowned studio musician?

Yes it is

John always looks so serious, like he's thinking of ways to injure you with his horn I heard he's also a Karate expert as well. That's a really neat horn!