Yes, the cane in the centre of the flower does seem to match one that has been used by both Paul Ysart and Vasart (and later) items.
Yes, the signature cane has different colours for the "p" and the "y".
Yes, the overall look of the flower and ground is not of the quality of Paul Ysart's work.
I contacted the seller with my views as soon as I saw the listing.
And I believe the weight was on eBay a few years ago - it already appeared in one of my lists of reference images.