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I'm looking to find info on a Conn 2 mouthpiece I have acquired. It does not have the vintage french horn style or the 1792-2 style either. It has an appearence of a conn 18.

Included in this link are a picture of the 2 mouthpieces I was talking about and the one I have
Here is the link to pictures:
https://www.dropbox.com/sh/zorhv1fr2i2u ... jwzna?dl=0

Are the rim and interior shaped like a "CONN HELLEBERG 7B" and/or like an 80-to-90-year-old "CONN HELLEBERG" ?

That's probably all that matters, unless someone is some sort of collector, eh?