I don't think I explained myself well or at least I wasn't understood well. I don't really demand references, it just depends on how logical or consistent the opinion. A few times I have read some pretty wild suggestions, without any real basis. For instance I thought most of your comments on the ecu were brilliant, and much appreciated. I see you link was deleted, but I am fairly well acquainted with ancient roman coins, and that sort of crown was very common. I didn't really think it was however a portrait of a particular emperor, as most just seemed to be generic busts, although I don't deny the possibility. I would wonder how a silversmith would choose one over another, perhaps on how much they liked Christians. I am not sure either way on an 18th century ruler using such a crown either, but I thought the nose was very similar to that of Charles VII. And I think there can be little doubt that the Holy Roman Emperors considered themselves as inheritors of the ancient Roman Emperors. I see your point about the elector of Bavaria, and presume you are more acquainted with how it worked than I am, so my idea is wrong, I kind of hinted that myself, since it seemed too early.
Here is the spoon and coat of arms:

The spoon is a monster, the second biggest I have ever had, approximately 37 cm long. Augsburg c. 1730 by Johann Wagenknecht.
As far as the emperors on beakers, the ones I have seen were all repoussee like this one:
The beakers and tankards with lots of coins, which I have seen, were all relatively contemporary to the piece. I don't remember ever seeing ones with ancient coins, but I may be wrong. The roman coins on silver we see here are mostly on silver c. 1850, when the craze took off. I remember some that really looked like coins. I had a Gorham set, that would have fooled a lot of people.
I am very happy to get your opinion on this. I should add that I have given up trying to figure out this coat of arms, at least for now.
It is a bit similar to that of Bremen, but not close enough. You would think a simple one like this would be easier to find.
Maurice