Any "information" suggesting that it is a prototype should be treated with suspicion.
This French forums is probably the best of the active dive watch forums, so if you pose your question there, you are more likely to encounter a useful, expert opinion:
http://www.forum-mdp.com
There are plenty of vintage experts here, but dive watches aren't a primary topic. I actually own more than a few vintage divers myself, but am not knowledgable about Aquadive.
Regards,
Tony C.
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