Hi,
Just found the attachment whilst trying to date my A65 engines.
Bizarrely I have one engine with the old system (A65LC *****) which is dated 1969 and the other with the new system NC***** A65L which is dated 1968, I wasn't expecting that.
The Roy Bacon publication does not give the full new system year codes only D,E and G so I was struggling to date the NC***** A65L engine. The attachment gives all the year prefixes C, D, E, G and H.
Hopefully this attachment is correct...