Merrifield Set with Stamped Box

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This is the classic Merrifield design, in a stamped Merrifield box. According to the auction lot description, the box is stamped "Merrifield Gt Turnstile" which would be most interesting because the other stamped boxes and labels indicate 11 Great Turnstile or 13 Great Turnstile, where Merrifield moved circa 1829. If this stamp is vague, then it would probably indicate a transitional period -- either 1819-ish, when he first moved to 11 Great Turnstile, or late-1820's when he switched addresses on Great Turnstile.