Type 24:  AE4.  VOT XX MVLT XXX in wreath
378-383 (These are vows of Gratian.)   (VOT X MVLT XXX is 24A, below)
Struck for Gratian, Valentinian II, Theodosius, and Arcadius. It is common for Gratian and Valentinian II, but rare for Theodosius and Arcadius.


 
Gratian
AE14, 5:00, 0.91 grams.
CONB*
RIC Constantinople 64a

   (More images below)

No photos in RIC.
RIC Ant 66 for Theodosius is noted as possibly a hybrid, "R". It is dated to the period 383-388, but RIC does not list it for the co-emperors, so it is most likely a mistake.
RIC Ale 14 "confirmation required." p. 301. Cayon  no photos. Gratian 77,79 (0), Valentinian II 80 (0), Theodosius 78 (0), Arcadius --.

Hunter  none
 

Type 24A: (Variant for Theodosius and Valentinian II) AE4. VOT / X / MVLT / XXX in wreath. 

Theodosius
14-12 mm. 1.31 grams.
VOT X MVLT XXX
DN THEODO-SIVS PF AVG

Mintmark not clear. Maybe ANT ... 
RIC IX Antioch 57 "r5" (Only for Theodosius and only officina Δ)

This type is in RIC only at Antioch and only this issue, recorded as unique. Because it was not issued at other mints, at first I thought this was simply an engraver's error for VOT / XX / MVLT / XXX, but this example has the "X" well-engraved right in the center -- it looks intentional. Cayon T-77 (0).

An unlisted piece discovered by Marc Schalley. This is his coin and photograph.
It was discussed on CoinTalk: https://www.cointalk.com/threads/a-rare-valentinianus-ii-vot-x-mvlt-xxx-coin.393349/
Valentinian II 
12 mm. 1.11 grams.
DN VALENTINIANVS PF AVG. Note the unbroken legend, which usually indicates a junior emperor.
 VOT
    X
MVLT
 XXX
SMNB (? It is hard to be sure.)
Not in RIC IX, but if the mintmark is SMNB it would be from Nicomedia. The type VOT/XX/MVLT/XXX is RIC Nicomedia 39. 

 

Gratian



  Gratian
  AE15, 6:00, 1.86 grams.
  SMKA
  RIC Cyzicus 22a


  Gratian
  AE14-12. 11:30. 1.17 grams.
  SMKΔ  (might be an A)
  RIC Cyzicus 22a

Valentinian II:  Cyzicus, Antioch.

Valentinian II
15-14 mm. 1.21 grams.


SMKA
RIC Cyzicus 22b