Re: King Zephyr mouthpiece?
Try a Rico Royal Graftonite B3 mouthpiece with a Rovner Dark ligature. The mouthpiece sells for around $20, and believe it or not, it's a great piece! If you're looking for a warm, dark tone, I think you would be very pleased with it. The Otto Link 6 is fairly dark as far as metal pieces go, but you'll get a warmer sound from a hard rubber or graftonite piece than a metal piece.
A lot of players back in the 1940's and 50's really liked the King horns. I pulled up a site with some old ads and here are a few names:
Yep! If it's good enough for Cannonball...