The youngest of the easily found patterns designed by Charlotte for Crown Ducal. The design date can be accurately stated as August 1940 because a tableware pattern number 6179 is dated August 1940 and the Pottery Gazette article featuring Mexican was published in the September 1940 issue.
All Mexican examples seen with the AGR5 backstamp are of the type 481 type meaning they are post summer 1942 and are unsigned so this means that production of this design continued or restarted after Charlotte had left. These items account for just under 10% of production,
The glaze used for Mexican is similar in colour to the blown yellow matt used for the Spanish Tree pattern, but there is a distinct difference in the mottling effect between the two. The pattern book names the glaze simply as No. 72, and although this glaze number is recorded in another of the Richardsons pattern books there are no details. Instead, the entries for glazes 66 to 77 are annotated “see Mr Highfields book for descriptions”. Unfortunately no other documents have glaze details so presumably Mr Highfields book has been lost. Also, the name is not mentioned in Gerrard Shaws dissertation or book which includes a lists of known employees up until 1945 but the assumption has to be that Mr Highfield was a co-worker of Charlottes who was responsible in part, at least, for developing or recording the glazes used by the company at this time.