Great thread and wonderful coins.
Really hard to pick, I have so many coins I love. But if I had to pick one ancient, it would be my Alexander III gold stater.
I love it because of both the period and its beauty.
Alexander III ‘the Great’, 336-323 BC gold staterObverse: head of Athena to right, wearing Corinthian helmet decorated with a serpent.Reverse: AΛEΞANΔΡOΥ Nike standing front, head to left, with her wings spread, holding laurel wreath in her right hand and stylis in her left; below left wing, crescent above AMint: LampsakosDiameter: 17 mmWeight: 8.60g