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So I stopped in at the site and got some pictures for you, can't seem to post them, so send me your email address via a PM and will forward them to you. It's an old TIE system, just not sure it's what you want.
Kevin

If the information you found is from the typewriterdatabase, that is the information I recently shared.

I thought it might be a standard alternate type connector rather than a "proprietary designed" which IBM seems to love so much.

I can see why it would require the key. You wouldn't want someone plugging a 10 Base-T modular connector into the back of the IBM 85/95 Electronic Typewriter, or the 6731. Who knows what might happen.... Bzzzzzz *POOF!*