There is a listing and parts break down in a Stewart Warner book from the mid 50's but it doesn't say what it fits which usually means it was called a trade speedometer, sold in the aftermarket.
It kinda looks like an old SW unit, but I'm pretty sure they marked all of their units my name. Although it looks a lot like a 32' Ford unit.. Military surplus is a strong possibility.
100 MPH is pretty fast for most military applications. I'll check around the shop and see if I have anything written down.
The Jalopy Journal
