Nice! I played that with a couple other trumpet players at an outdoor community concert band concert about 40 years ago. The other guys weren’t really good double-tonguers, so I played the solo version while they played the 2nd and 3rd trio parts.
@ssmith1226 Single brace on outer tuning slide, what appears to be an Amado water key on a "C" shaped tuning slide, no adjustable 3rd slide apparatus, no apparent bulge nor reflection from what would be the hexagonal end of the mouthpiece receiver. Probably not a Bach. No irregularity/reflection where the 3rd slide stop limit screw would be found on a Yamaha, either.
Here's a blurry video of probably the same horn. A ring on the 1st valve slide and dents in the bell: Youtube Video
And if that's not blurry enough, check out this extra-blurry video:
