Obverse: 'FL VAL CONSTANINVS FIL AVG' - Laureate head right.
Reverse: 'GENIO CAESARIS CMH' - Genius standing left, pouring liquor from patera.
RIC: VI 56
NB - Galerius proposed that Constantine be formally recognized as Caesar of the West, although Constantine did not acquiesce. Maximian Daia remained as Caesar of the East. Constantine was incensed at his proposed "demotion" to Caesar, subservient to Licinius as was Maximinus at the elevation of Licinius to Augustus over him, and so Galerius Maximian designated both of them Filius Augustorum: "Son of the Augustus" -- a somewhat empty title of convenience and compromise (Cited from: https://www.cointalk.com/threads/filius-augustorum.320802/)
