thanks for posting examples of Davidson pieces, Fred - again I think the key itself is not a match for Davidson. Not being too well up on these things I assumed there 'looked' to be some sort of similarity with Davidson, but as you say this seems not to be the case.............. having seen very many sugars over the years, their patterns tend to blur a tad in the mind's eye.
Designs composed of dots were not confined to G.B., and having been around pressed glass for a few years, I should have known better than to say 'presumably British'.
Sugars are possibly one of the most common shapes in pressed glass, and it might be thought this pattern would have surfaced before now. Hopefully, someone may yet recognize it.
Those amber pieces are very attractive.