My dear Sir
Remember yr promise will you dine here on Sunday to meet the Holcrofts? –R.S.V.P.
If not, when will you come?
Source: King and Pierce
 Thomas Holcroft died 23 March 1809, so letter must be before that date and after March 1799 when Holcroft was remarried to Louisa Mercier (Becoming “the Holcrofts”)