Tony's weight may seem familiar to some of us. It appeared in Toovey's auction room in 2002. I think it was in a Lot with a PY Harland Flower weight. It is interesting that it came back to the UK via an American paperweight maker!
The "Interlaced Garland" (or, more accurately "Interlaced Trefoils") pattern is, indeed, uncommon within Ysart weights. [The basic pattern is quite well known from antique French weights.]
An alternative form of the design is sometimes called a "Looped Garland" or "Chain Garland", and these can have the same canes for both "sides" of the loop or a set of different canes for each "side". In these versions, the loops are separated by another cane.
[Sophie's reference above to the no. 13 weight shows a "Looped Garland" example with alternating same colour loops. Direct link here.]
I am not sure, but I think there are only two "Ysart" examples of the Interlaced / Looped pattern illustrated in general books.
One example (unsigned) is of the "Looped Garland" style with alternating same-cane loops. Instead of a millefiori central pattern, it has a cane-wing butterfly and even with no signature it is clearly a Paul Ysart weight. It appeared in the 1940 book,
Old Glass Paperweights by Evangeline H. Bergstrom. It is also shown in colour in the 1969 book of weights in the Bergstrom-Mahler Museum. In
Old Glass Paperweights, it was shown in a section for "Bristol" and was not removed from the later edition of the book, unlike two signed PY weights which were originally thought at the time to be by an "unknown French maker".
Another book,
Paperweights, by Sibyille Jargstorf shows an Interlaced Garland version on page 167, but is included as "possibly Vasart" (which, I would suggest, implies a likely Salvador Ysart item).
For those who have a copy of the catalogue of the PCC 2013 Ysart Exhibition, page 85, in the section for "Salvador Ysart & Ysart Brothers (Vasart)", shows an unsigned Interlaced Garland weight. Like the weight in Jargstorf's book, I believe it was made by Salvador Ysart.
Another unsigned "Looped Garland" weight is held in Perth Museum & Art Gallery. A thumbnail image is freely available in the site:
www.scran.ac.uk - use the search facility to locate "000-000-591-491-C", or search for "ysart" and select page 4. That weight is attributed to Paul Ysart.
Does anyone know of other references to these patterns by the Ysart men?