Slide Whistle - American Plating Co.
Adam wanted to get a cool slide whistle like the one used by John C. Dvorak, so he ordered a snazzy metal slide whistle on Amazon. It’s made by the American Plating Company and comes in a box that, according to Dvorak, looks like it was made in the 1920’s.
You can get your own from Amazon. The other model that is similar is the Grover Trophy model.