Double die matches on a
rare provincial coin such as this are to be expected.
The issue was quite likely struck using only one set of dies.
If you plugged even these low numbers n=3, do=1 and dr=1 (in other words three known coins, one known
obverse die and one known
reverse die) into the Esty formula I expect you would get a result indicating one die was most likely - but I am
still in holiday mode and too lazy to do this.
Anyway, this phenomenon (that single die runs are common) has been discussed by authors such as Harl in Civic Coins and Civic Politics in the
Roman East, 180-275.
Nice coin.
SC