Rare is not rare in Roman Provincials, and affordable condition and rarity are benefits of wandering off the most well worn paths of ancient coins.
This nice sized coin, 22.5mm and 7.54g, is my new favorite depiction of both Julia Mamaea, mother of Severus Alexander, and the iconic she-wolf and twins of Rome. It was minted in Deultum, a Roman colony in the province of Thrace, on the eastern edge of modern Bulgaria, that had a port connected to the Black Sea.
There is only one of these coins listed in ACSearch, Coryssa or the SixBid archive - it seems it will be quite a while before another one comes up for auction. This coin is particularly well preserved and nicely struck. The reference coins appear to come from only a couple of dies.
Thrace, Deultum, Julia Avita Mamaea, AD 222-235 during the reign of Severus Alexander, with Julia and her mother as regents. Æ23
Obv: IVLIA MAMAEA AVG, Draped bust right, wearing stephane
Rev: COL FL PAC DEV-LT, She-wolf standing right, suckling twins
Ref: Jurukov 174 (same reverse die), Moushumov 3615, CNG Featured Coin (same dies), SNG Bobokov 675 (same obv. die), Windwinds shows Varbanov 2378 (same dies)
The Roman colony was founded during the reign of Vespasian and its full name, Colonia Flavia Pacis Deultensium or Colonia Flavia Pancensis Deultum, explains the reverse legend. Comparing with the plate from Moushumov you can see a variation in the legend (on a coin of Severus Alexander Plate XXII.2 3587).
Two useful reference books on the coins of Deultum are available online
and three that are harder to find online or in paper: