Watch List notes:

Attica. Athens. 137/6 BC. Tetradrachm (Silver, 31 mm, 16.79 g, 11 h), New style, Miki(on) and Theophra(stos). Head of Athena Parthenos to right, wearing triple-crested Attic helmet adorned with Pegasos. Rev. Α-ΘΕ / ΜΙ/ΚΙ - / ΘΕΟ/ΦΡΑ Owl standing facing on amphora; to right, Nike driving chariot to right; on amphora, E; below amphora, ΣΩ (= contractor's initials). Thompson 318b. A well-centered example struck on a broad flan. Minor marks, otherwise, extremely fine.
From the NS Collection, Switzerland, since before 2010.