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Collection, Preservation and Display of Old Lawn Mowers

JP Super 16" date of manufacture?

Hi,  I have read the informative article on dating the JP Super however mine does not appear to follow the format shown.  It is definitely a 16" model and so the number  according to the article should start with an X (12" having no code letter).  Well mine just has a number, which is 173.  Any idea when it was made and why no X?

See picture below.  Anyone able to help? Rob.