Thought I would throw this coin out for thoughts. I generally collect US coins, and dabble a bit in world and ancients, This coin purchased by my parents in the early 1960's when we lived in Turkey (my father was active duty USAF stationed there). My best ID is RIC VII 34 Constantine AE3 325-326 AD (not sure if that is the correct way to ID the coin) Two turrets with star above the campgate.