This is the best info I could find - this is not my area of expertise! : 

EGYPT - UNITED Ptolemy - Ptolemy II Philadelphus

(285-246 BC)

Ptolemy II succeeded his father in 283 BC, but it was associated with the business before that date. Married in 288 BC Arsinoe, daughter of Lysimachus, he married a second time in 276 BC, his sister, Arsinoe II. Daughter of Ptolemy I and Berenice, she had married successively Lysimachus and Ptolemy Ceraunos, his half-brother, and was deified, identified with the goddess Hathor, when she died in 271 BC Ptolemy was an important issue coinage restitution to remember him. During the last twenty-five years of his life, Ptolemy II had completed the Lighthouse of Alexandria.

Apparently the face is of Zeos.....

Check out this website.....

https://www.google.com/imgres?imgurl=https%3A%2F%2Fimages3.cgb.fr%2Fimages%2Fgrecque%2Fbgr_449463.jpg&imgrefurl=https%3A%2F%2Fwww.cgbfr.com%2Fegypte-royaume-lagide-ptolemee-ii-philadelphe-dichalque-ttb%2Cbgr_449463%2Ca.html&tbnid=8Q7__CokhtajAM&vet=10CAYQxiAoB2oXChMI8Mzh5vDi8AIVAAAAAB0AAAAAEAI..i&docid=93TwQpusd1nqwM&w=1200&h=563&itg=1&q=old%20greek%20coins%20images&ved=0CAYQxiAoB2oXChMI8Mzh5vDi8AIVAAAAAB0AAAAAEAI

The coin is heavy - 41grams! It is irregular but approximately 36mm in diameter.