I should mention the auction was held on Jan. 25 at 1 PM

How anything will appreciate in the future is really unknown. $100 for a Roseville Console Bowl is not a great buy, but it's not bad either. Now is a great time to buy American Art pottery. Values are...

The Saloff Cowan pottery book appendix says that shape no. 566 was released in 1925. It lists it as a 3" vase. There is no mention of 566A.

For some reason, photo isn't posted. But Moorecroft is quite collectible, and does have some value. Check Warman's.

There is no photo with the post.

This looks like a modern Chinese factory mark to me. If the piece doesn't look old, most likely it is not.