Regarding this item on eBay
, I have sent the following to the seller. Hopefully the information will be passed on to watchers etc.
Please note that this fish paperweight is definitely not an Ysart item, but seems to be a modern Chinese piece. There are two fish weights that are genuine Ysart pieces shown in the ysartglass website at: http://www.ysartglass.com/PaulYsart/PYfish.htm
I hope that, if you are unable to change the title and description of your listing, you will at least show this query so that people new to Ysart weights may also be able to check for themselves.
Collector of Ysart weights