The correspondence exchanged between Giacomo Gradenigo (1721-1796) and Joseph Eckhel (1737-1798) is of great numismatic interest. Thanks to evidence of coin finds communicated by his correspondent, Eckhel was able to provide a more reliable mint attribution for some Greek coin issues in the general reference work Doctrina numorum veterum (1792-1798). This paper highlights Gradenigoʼs contribution towards the classification of coins struck by the Greek cities of Issa, Pharos and Corcyra Melaina in central Dalmatia, as well as issues minted in Pale, Cephallenia. It also addresses the interpretation of Corinthian and Corinthian-style staters, casting light on the study of ancient coin finds at the end of the 18th century in general. An appendix presents three coins sent by Gradenigo to Vienna as gifts in 1776 and 1778.