The lion and unicorn mark is everywhere, used by the English first (British coat of arms) and Americans second, sometimes to just look English. It is a mark of Staffordshire pottery. Since you say it's heavy, it's probably ironstone.
American potters used the mark without any company name at first, but that started in the late 1800s, past Washington's time.
(yes, you must take good clear photos, of the front and back and a close up of the pattern. The pattern varies a lot, and you need to show it to experts to see if it's hand painted or a transfer, and so on.)
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