Hi Lorrydevil They are tetradrachm minted in Roman Alexandria, from a material called potin which is a mix of copper, tin and lead. I'm afraid that I don't know the type well and can't make out enough of the legends on either coin to give a specific identification. I'm sure someone more knowledgeable will weigh in shortly, but you might be able to find them yourself here/here Very handsome coins!
Tetradrachms (possibly a small trace of silver but mostly copper) of Alexandria of Galerius and Carinus - I can never understand how people today can't tell copper from gold. Both are quite collectable and would be welcome in my collection.