This is a single-flower vase, characterized by its long, slender opening. I believe it's Bizen ware? (Please understand that there's a possibility I'm mistaken.) The sheen on the back couldn't be removed even with wiping; it's not sticky. The stamp resembles, or doesn't resemble, those of the relatively famous Yamamoto lineage? Or perhaps it was made by a complete amateur. It's a complete mystery of a vase, so *Please note that we cannot accept any claims after purchase. Type: Teapot/Vase