This chart of Keian coinage shows coins having Sirius on their reverse side had a long history all through the 300's BCE. The letter assignments given to this coin on the chart are slightly incorrect being given as KAP'AY
Chart by Kenneth Sheedy in his review of the article of Kia by Charickleia Papageorgiadou, vol 24, 1967 published by the Athens research center. Online at: https://www.jstor.org/stable/42668563
(September 13, 2023, updated March 10, 2025) Image is of the star Sirius. The coin was found on Keos Island in the Aegean.
Sirius was the sun’s companion star and one of the brightest stars in the night sky. It was thought to lead the rising sun in summer. Because it is the sun’s companion it is also called the “dog star.” Sirius represents the interaction between the life powers (sun) and the motion powers from planetary motion and emotions (amplified by wine).
Comment: Ayu was the crescent moon goddess who edited the life network represented by the sun/storm god Hu. So this coin is supporting the life shepherding of Sirius over that of Ayu.