Hamilton was rife with English immigrants in the early 1800s so the dates you mentioned do make sense.
I am looking through http://collections.vam.ac.uk/name/new-hall-porcelain-factory/3990/ now to see if I see any similar patterns or colors.
Is the purple color of the design consistent with the early 1800s date?
And what do you think might have encircled the inside rim of the teabowl?
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