Well, I have three Conn Victors, all long models, but the 1917 is actually the longest, measuring at 17". The 1921 is 16 1/2". The 1953 is 16". My husband's Star Lawler Trumpet is 18" in length. The Bobby Shew by Yamaha turns out to be 19". I don't believe the difference, in two inches of length, will be that noticeable, in a picture taken from that distance, and that angle. My point about being a sketchist was not made as a claim to know the horns better, but to know the people in the photograph better. I draw all kinds of subjects, but people are my primary subject. The trumpet section is easily identifiable, to me, as Bix near the center, Charlie Margulies, with the curly hair, to Bix's right, and Harry Goldfield next to Charlie. If Bix is holding a trumpet, does it actually matter? He played in the trumpet section. The program, for the Whiteman orchestra, listed Bix as playing cornet, flugelhorn, and trumpet. It's documentation that there may have been times, when Bix was required to play something, other than a cornet. And don't forget, it is also simply a posed, publicity photo. It's not like they are actually performing a concert. Even if Bix always only played the cornet, there's no reason he couldn't hold a trumpet to his face, and blow for a publicity photo. To be honest, there's very little I can tell about the horn, from the distance the picture was shot. The impression I keep getting, is that the valves seem set a little further back on the horn, than the Strad, but I really don't know. You could ask a roomful of horn players, and I seriously doubt everyone will agree it's the same horn. As I always say, the only way to really know, is for someone to build a time machine, and go back to see these scenes for themselves, and document away. So much of this is still guess work, but that's still Bix in that picture! Lol!