Why Did The Sugar-Plum Fairies Dance?

A "sugar-plum" is an old-fashioned phrase for a piece of hard-boiled candy; it has nothing to do with "plums" (the fruit) and everything to do with "sugar". The proprietor in question was not known for his excellent spelling and grammar skills, as evident by the wording found in advertisements for these particular medications which can be found on this website.

The "anodyne necklace" on the back was sheer medical quackery, no more than a magic charm, and I suspect the "sugar-plumbs for worms" were as well. The advertisement says that they "...have only the taste of fine sugar, and are as innocent and easy to take as a common sugar-plumb from the confectioner's.". I suspect there's a good reason why they tasted just like sugar: they were only sugar, no other active ingredients required or necessary. I suppose it may have contained lead acetate (which tastes sweet so might not be detectable in a hard candy) but we can't derive its presence or absence from the spelling of "plumb".

As for the issue date, all the references I can find indicate "late 1700s", at about the same time as other Conder tokens.