Ed, I'm not sure that it is a projection lens. It is reminiscent of an unmarked lens in Ilex #3 electric shutter that I extracted from a Coleman Systems oscilloscope camera. And yes, I can see that the original poster's mystery lens is in an Ilex Acme, not an Ilex electric.
All that said, it smells of an opportunistic remount of a no-name lens, perhaps from a 'scope camera, in an Ilex shutter extracted from equipment. Probably not a good lens, but the shutter has value and until the lens has been tried out we can all hope that its good enough.
Cheers,
Dan
Cheers,
Dan