Dan,
The number on tag of motor is 7518 16674. I just went and looked at them I was mistaken they say"to fit OMC" then 580-416 below that and below that Made in West-Germany. They do fire hotter than a firecracker.

Looked it up it appears to be a 1958 7.5hp I guess some where along the way the coils were swapped.

thanks,
Joe