 The reverse side of his coins depict an elaborately decorated Boeotian helmet.This might have been meant to extend his connection to the army, and/or to further emphasise the idea of martial luxury.The break with the Seleucids was also indicated by the abandonment of the Seleucid dating system, in which years were counted continuously from the rise to power of Seleucus I. Tryphon instituted a new system, counting from his own accession as king.