Paleopilot, I agree it does look like a telephone transmitter cup and the threaded edge makes it believable, but the different size holes are throwing me off. I thought, why would a machine company make an item with different size round holes? After sleeping on it last night, I wondered if it could be the cap to a vintage hanging lamp, where the connections would involve different size holes? I could find a pic exactly like I wanted, but the one below is fairly close. The 2 slits in the center would be for 'blades' and the different size holes for connections; one to the chain/hanging part and the smaller holes for the shade.

I really don't know, but am just throwing out some ideas. Breezie
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Paleo, I just remembered this post of yours:
http://www.treasurenet.com/forums/what/336335-what.html#post3187131
I was trying to connect those 2 blade like pieces through some type of hanging lamp. I'm wondering if the 4 holes would have held chains, and the 2 slits blades?
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Okay, I give up; it's a telephone transmitter cup . . .

Breezie