Best Studio Art Pottery Rustic Earthenware Organic Design Rock Cave Vases - Matching Set of 3

This set has a beautiful organic appeal. They remind me off sea life or rock formations you may find at the bottom of the ocean or in an arid landscape. Each piece is stamped with a art studio pottery mark on the bottom. I can't quite make it out but it looks like EWN or EWU, or possibly none of those.

The largest vase measures 3.25" tall x 7" long x 5.5" wide. The second largest is 2.25" tall x 5" long best x 4" wide. The last one is 2.25" tall x 4.5" long x 4" wide