Happy birthday! Your coin falls after the STARR groups, it's one of the mass coinage types. The most prominent characteristic of the STARR owls is that the tail has 3 distinctively split feathers.
Happy Birthday, Ryro!! (a day late, sorry.) And congrats (again - I had a sneak preview) on the fantastic owl! Didja buy yourself a Macedonian shield coin too? (Surely? You're worth more than one coin, yes?) Sometimes you can get Starr group owls incorrectly listed as mass owls. Like my Starr Group II, the first with the olive leaves and crescent : @Terence Cheesman tells me my mass owl is a Flament Group II, c. 440-430: I have no idea, but Terence knows his stuff on these.
Some time ago I did discuss the differences between the Starr group coins principally the Starr Group IV and V coins with those of the mass coinage principally the Flament Group 1 coins. Ryro's coin looks to me like a Flament II coin.