I found my Pigasus from Klazomenai. Obv. Forepart of winged boar right; rev. quadripartite incuse square. 0.31g - probably a hemiobol. I forgot to measure the diameter, but 7-8mm. ATB, Aidan.
Here's a tetradrachm of Alexander III, Amphipolis, with Pegasus on the reverse, vertical orientation. This coin is either a lifetime issue or early posthumous issue.
A modest grazing pegasus (couldn't afford flying I guess....) Amisos, AE23 Head of Perseus right wearing phrygian helmet AMISOS, Pegasus left, grazing 12.12 gr, 23 mm Ref : Sear #3639 Q