Asking the impossible--help with Mac & Di provincial

This one has very rough, corroded surfaces and I can't make out a single letter of the inscription on either side of the coin. I believe it's Macrinus and Diadumenian based on the portraits. It's probably -- but by no means certain -- from Moesia Inferior or Thrace, based upon the presence of a "centration dimple."

It's tetrassarion-sized:


Macrinus and Diadumenian
Roman provincial Æ (tetrassarion?) 25.2 mm, 10.06 g, 12 h
Unknown city and issuing authority
Obv: [illegible inscription], lauriate and draped bust r., facing Diadumenian, bare-headed and draped bust l
Rev: [illegible inscription], female deity (Ceres?) standing left, holding object (corn ears??) and cornucopiae.
Ref: ?

I'd be grateful for anything to go on! Thanks in advance!

 

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On reverse, It looks like a deity riding a horse. Head Left.

 

The only thing I have in my collection with confronted busts of Macrinus and Diadumenian is from Markianopolis, but the reverse looks different from what I can see on your coin:

MACRINUS
AE 26
OBVERSE: ΑΥ Κ ΟΠΕΛ ΣΕΥ ΜΑΚΡΕΙΝΟΣ Κ Μ ΟΠΕΛ ΑΝΤΩΝΕΙΝΟΣ Κ, laureate head of Macrinus right facing bare headed head of Diadumenian left
REVERSE: ΥΠ ΠΟΝΤΙΑΝΟΥ ΜΑΡΚΙΑΝΟΠΟΛΕΙΤΩ/Ν, Artemis, huntress, advancing r., reaching for an arrow in quiver at shoulder and in her l. hand holding a bow; below a hound. E to centre l
Struck at Markianopolis, Moesia Inferior, 217 - 218 AD
10.4g, 26mm
Moushmov 532

 

I see Tyche on the reverse, holding cornucopiae and rudder.

 

Looking at it in hand, I think that's it.

 

Definitely! You can see enough of the tops of the heads to know that the style is that of Macrinus and Diadumenium and of course you're right about the overall style being typical of Moesia Inferior.

At a glance the reverse seems hopeless but Zumbly is right-- you can definitely make out Tyche standing left, holding a rudder and cornucopia;.

 

Looking through Wildwinds, acsearchinfo, Sear's Greek Imperial, it's clear there were only a few cities that struck these coins of Mac & Di with confronted busts and this has to be Marcianopolis. Moushmov 571 or 575, I think.

 

Until someone mentioned Tyche, I was ready to go with Artemis advancing r.

 

That would make it a coin like this one, from Marcianopolis, rev. Tyche with cornucopia. This is a pentassarion (marked E for 5 assaria), 26 mm, 12.17 gr.

 

The E is visible on the OP coin so now you are down to cities that marked the denomination that way.

 

That narrows it down to Markianopolis for sure.