The dates given for some series are based on the dates of issue of regal coins using the same punches. Jettons must have been reasonably contemporaneous, because coin punches are unlikely to have been kept for long after their coinage use had ended.
Unique reference numbers for jettons use the series below with the obverse and reverse numbers appended. Thus, a groat sized jetton, bearing the King's head, with obverse #2 and reverse #3 would be '1b.2.3'.
Series 1 jettons are groat sized. Series 2 to 4 are approximately sterling penny sized.
Jettons of series 1 to 4 do not have readable legends, the wording seen on coins being replaced by symbols or occasionally, random letters. Many Series 5 jettons have readable legends, usually of a religious nature, but occasionally alluding to their purpose.
Click on Blue text, in the list below, to view the 'obverses' page for a series.