I'm fairly certain this is Sowerby, I don't remember the pattern name, but I'm sure Glen will know.
btw. the lack of a ground footrim doesn't always mean a later date, just depends on how the piece was finished. Ground footrims tend to be earlier as they show the piece was hand finished & not made on a fully automated line, but the opposite is not always true; for example, if a piece was held by a spring punty to fire polish it there'd be no need to grind the foot.
Steven