Watch List notes:

Greek Italy. Southern Apulia, Tarentum. AR Nomos, c. 344-334 BC. Obv. Hippacontist wearing crested helmet galloping right about to hurl a short javelin, which he holds in right hand; behind, Nike flying right crowning him; behind, ΦΙ / Π|-Μ. Rev. Phalanthos astride dolphin left, holding one handled vase; the left hand resting on dolphin back; to right, ΤΑΡΑΣ. HN Italy 894 and 895; Vlasto 536 (for Obv.) and 537 (for Rev.); Fischer Bossert 795 (V311-R616). AR. 7.69 g. 22.00 mm. RRR. Attracvtive specimen, lightly toned with underlying luster. About EF. Exteremely rare: Vlasto cites example 537 (which obverse for this author is from the same die of 536, with added star and a large flaw on horse's tail) as unique.
After careful observation we can say that the obverse die of 537 is not the same as that of 536, in fact it presents details that differentiate it: in addition to the aforementioned star (which for Vlasto is added to the previous die) also the detail of the crest of the helmet and of the inclination of the javelin.
For another specimen see: Gorny & Mosch, Auction 147, lot 1086.