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Thank you all for your informative replies . I did check the service bulletins but could not find it in the index . Thank you for locating it for me . Interestingly the English parts book for 1930 lists the washer at 4 pennies but the 1933 list shows 8 pennies ,inflation !!! The washer is in the English service bulletins for June 1930 not Feb as the USA bulletin also although the picture is the same the script also advises to read the July/Aug 1929 bulletin to make sure the mechanic pays good attention to make sure the cam nut is tight . The washer is slightly convex and seems to be spring steel the cam gear was a regular "Celeron " . I do not think this gear could have been changed if the cam was still in the car the nut was super tight . I had sold the cam to a buddy who had a worn cam so I had to remove the old one as it was very worn anyway .I cut the gear into quarters removed the outer and got a 2 foot stilson pipe wrench on the nut to remove it you could not have done it in the car for sure .The washer certainly works as a lock washer !!!
John in still in lock down hurry up with the vaccine Suffolk County England .