Inverted Thistle Reproductions
Inverted Thistle was reproduced in several shapes including water sets. This one is green opal and sold for $120 in 1998. Also known in salt and pepper shakers. In red, these sell for $10-$15.
I don't know who made them, but I've seen a couple of these red bowls sell on eBay for $25-$40.

Classic Inverted Thistle