Quite a wide spread of dates, I'm afraid: she is the longest-serving consort in British history, having served as such from her marriage to George III on 8 September 1761, to her death on 17 November 1818, a total of 57 years and 70 days. (Prince Philip is only months away from ousting her, though).

It may not help much with the dating, but I wouldn't think her foot would be referred to as "neat" in her later years