And just to expand a little further ...
Another reference suggests "Vasart", but actually states "Moncrieff" in the text!! This is in Bob Hall's Scottish Paperweights book, in "Chapter 4 - Ysart Brothers Glass, Vasart 1946-1956". Four weights are shown, three of which are fairly typical "Eisner 4-flower on green ground". The other weight is a 3-flower version over a "blobbed" coloured (mainly red and white) ground.
The text states that the weights were made by "Frank Eisner at the Moncrieff's works in the 1930s". So on that basis alone, they should not be in the chapter on "Vasart".
Also, the 3-flower example shown in the book is one that I have personally handled and it has engraved details to the base including "Waterford 1950". The weight and its engraved details are very much like an example I have, also stating "Waterford 1950".
At the time of finalizing the book, I am sure Bob did his best to get latest information into print, but unfortunately the details for the Eisner weights ended up in the wrong place and with some inaccurate detail.