What a lovely collection, Petrushka.
For the enamel beakers, "less than perfect" is best. It shows age. But, by the same token, it is fairly simple to take a brand new one and bang it up a little. The enamel is usually the give-a-away, I would say. Original pieces, the enamel is pretty thick, and there is a lot of lead in the content. The newer reproductions are thiner and the decal work is a not as defined. For the prices you have quoted, I would not worry about it. Actually, probably quite lucky ! The repros I have seen being sold as "originals" are a lot more costly.
The glasses I would buy only from a reputable dealer who guarentees his merchandise. Several have been mentioned on this thread. The fakes are being sold by the crateload and are too easy to tell. You would not need me to tell you.
I have reently seen the "coronation scarves" being sold here in SF- right of the litho looms of China.
Bear in mind, I am not an expert, always best to deal with someone in person who is reputable.
BTW, there is nothing wrong with reproductions, imo. As long as they are sold as just that- reproductions, and at a reasonable price.
It would be interesting if someonne would write a book on just these coronation souvenirs, as there were several different items and designs of varying quality.
Cheers,
Robert