RMC/Daryl. Birmingham date codes ran from 1921 to present with a gap from 1941 to 1949. London marks ran from 1975 to present. You will find them stamped on the barrel flats and are in the form of a small mark like an X which is actually a crossed sceptre mark. Within this will be a number 1, 2 or 3 for the Proof Master on duty that day. There may be one or two small letter also which give the year date it went through the proof house. You may need a magnifying glass to see them clearly. The crossed sceptre mark is about the size of this X on the page. Lagopus.....
