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 (£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.