Watch List notes:

CILICIA. Uncertain mint, perhaps Mallos or Nagidos. Circa late 5th - earlier 4th century BC. Hemiobol (Silver, 6 mm, 0.37 g). Sea turtle with segmented shell. Rev. Astragalus. SNG Levante Suppl. 8 (as Nagidos, possibly from the same reverse die but the photograph is too poor to tell). For an inferior example from the same dies, see CNG 88, 2011, 437 (as Asia Minor uncertain). Very rare. Uncleaned as found, otherwise, good very fine.
From the "Collection sans Pareille" of Ancient Greek Fractions and from the collection of L. Mildenberg.

This coin has been very tentatively placed with the coins of Mallos because of the astragalus that appears on its reverse, but Levante's attribution of another example to Nagidos should be taken into consideration.