Gematria Denominations on Greek Coins
Pi = 80, Mu = 40

Ptolemaic Egypt, Cleopatra VII, 51-30 BC. 80 Br Drachmae, 22.3 gm. Obverse: Diademed & draped bust facing right. Reverse: Eagle standing facing left, cornucopiae in left field, P (denomination = 80) in right field.

Ptolemaic Egypt, Cleopatra VII, 51-30 BC. 40 Br Drachmae, 8.43 gm. Obverse: Diademed & draped bust facing right. Reverse: Eagle standing facing left, cornucopiae in left field, M (denomination = 40) in right field. 480 bronze drachmae = 1 silver drachma