That's my point and we have seen just how much it varies in this one thread.
Sure, but in the case fo the BM786 in question, it is absolutely not a prototype no matter what way you look at it, it would have come form the first small production batch just like mine did.
There is no hard and fast rule of what a "prototype" refers to, it is defined on an individual/company and market related basis.
Your comment falls apart once we talk specifically about the BM786.
The BM786's Brymen supplied have different plastics, printing, fuse holders and shield for the beeper. They were basically a BM789 case where they printed and hand placed labels over the front cover. I doubt they made very many of them.
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The oldest 78x they provided me does not have the model numbers marked on the backside and only three listed on the top side. The layout has changed a fair bit from this one. The latest ones I have are marked 783-789 both top and bottom. The earliest is marked 785, 787 & 788 top side only. This unit was supplied non-working for spare parts or scrap. It was old enough to have hand wired jumpers.
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