Keramos in Caria, 420-400 BC., Chalkus, Ashton, NC 1998, p. 46.

Keramos in Caria, ca. 420-400 BC.,
Chalkus / Æ10 (9 mm / 1,16 g),
Obv.: bull standing right (on a ground line).
Rev.: ΔΛO , three Carian letters (abbreviation of the Carian city name) below dolphin swimming r., dotted circle.
cf. SNG Kayhan 804 (DVO) ; Ashton, NC 1998, p. 46 (pl. 16, 1) .

http://cnrs.academia.edu/KorayKonuk/Papers/317168/Coin_Evidence_for_the_Carian_Name_of_Keramos : The letters can be transcribed as "kbo" - the first letters of the Carian name of Keramos.

Ceramus or Keramos (Greek: Κέραμος) was a city on the north coast of the Ceramic Gulf—named for this city—in Caria, in southwest Asia Minor; its ruins can be found outside the modern village of Ören, Muğla Province, Turkey.
Ceramus subject at first to Stratonicea, afterwards autonomous, was a member of the Athenian League and was one of the chief cities of the Chrysaorian League (Bulletin de corresp. hellén., IX, 468). In ancient times, it probably had a temple of Zeus Chrysaoreus. In Roman times it coined its own money. It is mentioned in the Notitiae Episcopatuum until the twelfth or thirteenth century as a bishopric suffragan to Aphrodisias, or Stauropolis. Three bishops are known: Spudasius, who attended the First Council of Ephesus in 431; Maurianus, who attended the Council of Nicaea in 787; and Symeon, who attended the council in Constantinople that reinstated Photius in 879.