Watch List notes:

Achaia, Patrai (45-40 BC), Æ Tritemorion or Tetrachalkon, helmeted and draped bust of Athena right, rev. Poseidon standing right, holding dolphin on his outstretched arm, throwing trident, Patrai monogram in left field (BCD Peloponnesos 514; SNG Copenhagen 159; HGC 5, 65), almost very fine.
Provenance
Purchased Baldwin, February 1961 - £0.10.0
'Ex Rogers Collection'
Estimate: £50 - £80