Remember drachms were supposed to be silver sir. Egypt was short of silver but had copper, so made massive copper coins instead of small silver ones. Same with the sestertius, which was a small silver coin in the republic and was reinvented as a large brass one instead.
The Ptolemaic dynasty also known as the Lagids after Lagus, Ptolemy’s I father, who ruled from 305 to 30 BC, had a complete monetary system not only in gold and silver, but also especially in bronze. In this system it is possible that the heaviest coin weighting more than 90 g corresponded to one drachm.
I thought it was the octobol sir. The drachms of Ptolemy III were usually 70ish grams, and octobols 90+. The Ptolemies as far as I have read had a gold mine the pharoahs used and copper mines, but silver was scarcer in their country, which is why they came up with the idea of very heavy copper as replacements for smaller silver coins.
I only have an AV Oktodrachm Ptolemy III AV octodrachm ND Alexandria Mint 26mm. 27.83g. 12h Ptolemy III Euergetes 246-222BC This one is common, they struck lots of these. Mine is close to EF.
