With the potential of being declared a thread hijacker, let me simply jump on board with @sierraone for just a moment.I worked as an international police contractor in Eastern Europe and the Middle East for the last 13 years of my working life. Archaeology and antiquities had always been a big interest/hobby of mine. As such I found myself living and working in the middle of the ancient world. So I took full advantage of it during those 13 years. Obtained a BA degree in maritime studies/archaeology, (all college studies prior to this were in criminal justice). Went on terrestrial and underwater investigations during my cto/vac time. And went to the major museums of the Greek and Roman world. This also took me to the English gun world during several trips I made to London. Back to your original question, I have two Alexander tetradrachms, hardly a collection. 18 months of those 13 years I was gone was in Kurdistan, conquered and ruled by Alexander until his death.
Ancient coins - like period fine guns, military antiquities, and art are a fascinating area of study. Like you, I became interested when stationed abroad - in our case, a couple of years at the Defense Attache' Office in Riyadh Saudi Arabia. We haunted the souks throughout the Gulf region for rugs, antiquities, and coins. It is a spiritual thing to hold a gun used by three or four generations. It is almost beyond understanding being temporary caretaker of something created and used a hundred generations ago.
My denarii collection runs 200 BC to the death of Marcus Aurelius in 180 AD.
The Greek coinage follows less rhyme or reason.