Very cool piece!.
I've always liked H-J's and their brothers the Sears Allstates...man, they're not loking so ugly any more are they?.
Looks like the Speedo head's been removed and is stuck at about 100 mph?.
Good luck w/ searching the vehicle's past!.
Here's a couple YouTube H-J's...there's more there too!.
https://www.youtube.com/watch?v=yQ0UM...ed&search=
https://www.youtube.com/watch?v=u9OzT3D_3t8
~ Pete