Swiss numismatist Hugo Doppler has identified a number of emperors stamped onto the coins: Aurelian (270-275), Tacitus (275-276), Probus (276-282), Carus (283-285), Diocletian (284-305) and Maximian (286-305). The newest coins are from the year 294.
Aurelian is one of my favorite emperors, he was one of the never-say-die / get-er-done leaders, and precursor to the reunification under Diocletian. Naturally, he was assassinated by some corrupt dunghole.