Color me crazy, but how about a Conn Vintage one, lacquered, with the red brass bell? A friend of mine once had one of those which was VERY nice and probably very close to what you are looking for in terms of sound.
It was dark, smooth, and surprisingly enough, it was ultra-responsive. A very nice horn. He ended up getting rid of it so that he could get a Lawler, but for the life of me I don't know why because if it had been mine, I would still own it.
Yeah Eric! I'm talking about YOU!
