There is, in my opinion, a distortion in the current market price for various Ysart weights. This is due to a few buyers with available funds competing against each other. Also, over the past year, a number of Ysart weights, including basic concentric designs, have been offered in auction with what I consider to be very high estimates, perhaps also as a result of a few people being willing to pay higher than normal prices.
This sort of distortion is not new and some years ago I competed against another collector for a Salvador Ysart concentric with a "Y" cane. At the time, such weights (which were regarded as rare because of the "Y" cane) were normally changing hands at around £300. The weight I bought had an early Vasart label to the base and (assuming the label was original to the weight at the time of making) this proved the use of the "Y" cane in the Ysart Brothers (Vasart) years.
With my interest in these things, I decided to submit a bid for the labelled "Y" weight that would hopefully see off all competition. I won it at around £700. But after that, any "Y" weight, even those with some poor quality features was being offered at anything up to the £700 mark I had set!
Hopefully the market prices will settle again at a reasonable level and I will be able to buy a few more Ysart weights to fill the gaps in my own collection.