1974 Camshaft, made in the USA?

[Mopower93]

I finally pulled my leaky motor out today, and pulled the valve cover, and almost got the shock of my life. Not only does this bike only have 8,000 miles on it originally, but the words "Made in the USA" right there, on the camshaft staring me right in the face  The only markings I found were EP-13 and MS1, anybody out there have any idea what the heck is in this thing?

[Re-run]

Well I am not up on all the different cams from the early 70s. I would have to guess that it is a russ collins(RC) cam. However, as there is no year, it is possible that it could be a megacycle or webcam but it does not sound like their numbers so I would discount them.
Sorry I cant give you more but I thought I would give some response since no one else has yet.