A few things I've noticed:
1)Even though it's only got a 9" bell, the horn is very heavy. Good thing I had a spare Bullet Brace laying around.
2)The thumb paddle for the F-attachment is a weird U-shape, but it works just fine.
3)The valve setup is unconventional. Instead of the springs at the pivot of each linkage, the springs are inside the rotary valve housing in between the valve itself and the stop plate. Seems to work just fine.
4)Whoever owned this horn previously must either ordered a special attachment tuning slide or had one made. The F tuning slide and the G tuning slide are interchangeable, except that the F is super long. With the tuning slide switched, I'm able to use the modern Bb/F/Gb/D tuning. You can see the switched tuning slides in the photos.
I'm very very pleased with how the horn turned out. Very mellow tone but it really barks when I lean on it.

