To the right of the throne, I can read lambda-epsilon-omega-sigma (...LEWS or ...LEOS) clearly; these letters are at the end of BASILEOS but not at the end of the name of any of the kings I can find that issued coinages like this. Unfortunately, "basileos" (king) appears on the coins of all the Hellenistic kings so doesn't help narrow down the date and ID.
If it is basically the same as the Lysimachus coin I linked to above (which is quite likely; I haven't found any other rulers with this mintmark combination used), it would date from some time after Alexander's death - some of the coins with this mintmark combination on the
Wildwinds index for this ruler are dated to 301-297 BC; I suspect this is the date range which the most recent scholarship has indicated for these coins.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis