S.F.Edge was very prolific in the 1920s when Governing Director of AC Cars Ltd. by producing promotional material that was sent to Dealers and AC owners.
Attached list shows letters dated between 24 March 1924 and February 1928 - The key is the reference by the faithful secretary "P" and the sequential numbers.
Attachment 1 is listing of letters I have, attachment 2 is example of letter, note that it's undated, but because of reference No 113, places it between 5 August 1925 and 21 December 1925.