Here's one you don't see every day! This is an FE Olds 'Ambassador' Alto Trombone in F.
According to the F.E. Olds Catalog:
The AMBASSADOR Alto Trombone is designed to fill a long-felt need for beginner trombone students. Believing there is a definate place for this instrument, OLDS is offering it in the popular AMBASSADOR line, priced within the reach of every student.
The shorter slide (22" as compared to 31" in a regular trombone) enables all positions to be reached and faciliates an easy and rapid change to a tenor instrument. The tone quality is comparable to a full size trombone and many professionals find this model of interest for the ever-increasing top range now being scored for the trombone.
Looking for a great horn for Beethoven, Schumann and other other alto licks? This horn has a solid sound that rivals many professional altos on the market today. It includes the original case and non-original, but instrument specific, mouthpiece.