Leni,
The weight is certainly a "match" to the one in Frank's pages, listed as "Jay" glass 1982. As the photos are copyrighted to Allan Scott, I take it that the info about it being a "Jay" weight would be ok.
But ... as far as I am aware all "Jay" weights had a "J" cane!
Although the end of John Deacons' "Jay" Glass period was early 83, the only lists of J weights I have seen (in John Simmonds book Paperweights From Great Britain 1930-2000) ends at 1981, so info on the Dahlia weight is not given.
Looks like conact with Allan Scott, one way or another, (or maybe John Deacons) will be the only way to find out anout this unsigned "Jay" weight