I have been off-line for a few days so have not have seen this until now.
I believe the the weight is a genuine Paul Ysart, but is, unusually, a little "wobbly" in parts of the pattern. Also, from the side view image, it appears that the dome has some wreathing - which is also unusual, particularly if the weight is from the Caithness years.
That may be why certain bidders kept their max bids low.