PTOLEMAIC KINGS OF EGYPT: Ptolemy I Soter (305-282 BCE) AE diobol, issued 294-282. Alexandria, 16.95g, 28mm.
Obv: Laureate head of Zeus to right.
Rev: BAΣIΛEΩΣ ΠTOΛEMAIOY; Eagle with spread wings standing left on thunderbolt; to left, monogram of A and M (Lorber 16)
CPE B55, SNG Copenhagen 91-3, Svoronos 206.
From TheRed collection
Excellent style, and the model for centuries of Ptolemaic bronze.

This coin was issued during Ptolemy’s last decade of life, in his 70s and 80s, after decades of war and establishing a secure hold over Egypt. During this time he wrote a history of the campaigns of Alexander, which was Arrian’s primary source; and therefore, by two degrees of separation, ours as well.