2001 Pottery with Swirl Pottery Mark

Hi there,
I recently found a green pottery vase in my mom's estate. It measures 7" tall and 17" around.
I am being offered $55 for it and I kinda feel as if I'm being ripped off. Please contact me as soon as possible with any information you have.

The bottom reads: 2001 and has a swirl mark similar to a snail design. There is a signature which is hard to make out-it could be S.F. with a circle around it.

I would greatly appreciate any help you can give me.

Ke'an