Vintage Wyoming License Plates

Picked up these three Wyoming license plates at the Rose Bowl. They are from 1958, 1962 and 1965. They have few digits and I am not sure what sort of vehicle they would have been on.
They do have an interesting bucking horse logo which is normal for Wyoming license plates from this time.
I was going to put this out on my plastic shed but it was bit wet outside to use my drill so I put them inside instead, which is also a bit more secure for them. Rearranged things on the wall and I think it looks much better now.
They have reflective paint which makes them harder to photograph with flash so I had to add some illumination with a vintage desk lamp. Photo three was done using the flash which makes it difficult to see the background color of the plates.