Here's a little bronze coin of a later Parthian king, in good style and condition. Nice also that it is dated according to the Seleucian calendar. Well, not very clearly, but I think it says YKZ, 400, 20 and 7. The 7 (zeta) is very obvious. But for the rest it depends if you read it from the outside of the coin or from the inside: 20 = K or 30 = L (Labda)? Osroes reigned from 109-129 or 421-441. If you read the date from the outside, it probably is 437.
Well, some of you probably know more about it, I hope.
Osroes I (109-129). AE chalkos. Obv. King with pointed beard to the left. Rev. Tyche to the right, year ZKY = 427 (=AD 115) or ZLY = 437. 11 mm, 1.55 gr. Sellwood 80.20.
-- Paul