Don't forget that anyone, worldwide, could register a design. My experience of pressed glass registrations is that many names in Thompson and the Blue Book turn out to be agents for mainland European glassworks, or factors and mail order companies developing designs, putting them out to tender, and going for the best manufacturing deal.
Many of these names will have been one man out on the road, and his wife or secretary doing the typing and answering the telephone, so are unlikely to appear as substantial businesses in the historical records.
If your trinket set is cut glass, I cannot improve on Ivo's previous reply, except don't assume it is of British manufacture.
If pressed glass, your trinket set will most likely turn out to be mainland European.
Finally, don't forget bottle works â€” who often appear to have dabbled in other types of glass, Bagley's being the most obvious example.