Good question. I've also noticed that his trumpet is rather unique looking. I don't think that it's molded but rather that it has some additional metal flanges and embellishments added to it. And where is the mouthpiece? It doesn't even look like it has one. I did a quick search of the offical PBS "Jazz" site but there's no place to leave any email. I also checked the Jazz at Lincoln Center site but I did not leave any email. Perhaps you can try emailing Wynton via the Lincoln Center site.
Marsalis's horn on "JAZZ"
Has anyone noticed the horn that Marsalis is using on the Jazz documentary? It appears to be some kind of "moulded " design rather than having distinct tubes of bent brass. This is probably some common thing to you that can actually play such an instrument, but, I have never seen a horn like this. What gives? Can any players enlighten me?