It's often better to get a non-uranium one for density testing if they exist. I recently picked up a vase of this general type - different design - in blue. It gave a density I would expect from the northeast 1860s. My view is that all of these uranium vases are 1860s northeast, based also off the Sowerby pattern number of 733 for that other vase. This is a breakthrough in itself as previously, folk were unsure of the age of these vases, guesses ranging all the way from 1860s to 1930s.