The flower weight looks like the one you sold on eBay in February this year and for which you posted a GMB Market Place thread. Is there another weight you are looking to sell, besides that one and the Butterfly?
Sale price expectations are hard to comment on. The winning bid (Â£180) on the Flower weight with a few bubbles in February seemed quite reasonable. I would think the Butterfly could make a bit more, but on the day it will depend on the bidders - although you can control that to some extent by setting a reserve or minimum opening bid.