This coin is not in RIC, though quite a few examples are known--
https://www.notinric.lechstepniewski.info/6ant-144_b.html Maximinus II
A.D. 310
Ӕ follis 26x27mm 5.9g
MAXIMINVS NOB CAES; bust l., helmeted [with gryphon crest] and cuirassed with gorgon on breast, spear over r. shoulder, shield decorated with two horsemen with draco standards and four prisoners on l. arm.
SOLI INVICTAE; Sol, rad. and in long robe, stg. facing, head l., r. raised, l. holding up globe, in facing quadriga; two horses turn l., and two right; in middle B.
In ex. ANT
cf. RIC VI Antioch 144
Though the mint of Antioch struck this type for Galerius and Maximinus; the obverse with the highly decorated armored bust was only struck for Maximinus II. Antioch was likely his principal residence from 309- 311, so not surprising this special type was struck there. This type may also have referenced the campaign against the Sassanids (not only the martial bust, but also battle scene on shield) waged by Maximinus (late 309-early 310) and perhaps also his desire to be named Augustus; which may have happened during the same campaign-- “at the last general muster he had been saluted by his army under the title of Augustus.” (Lactantius XXXII) Galerius recognized him as Augustus (mid 310) but since the troops of Maximinus had already raised him up, this was probably just a formality.
a bit from Ammianus Marcellinus on the draco standards carried by the horsemen on the shield-
"Behind the motley cavalcade that preceded him the emperor's person was surrounded by purple banners woven in the form of dragons and attached to the tops of gilded and jewelled spears; the breeze blew through their gaping jaws so that they seemed to be hissing with rage, and their voluminous tails streamed behind them on the wind." The Later Roman Empire book 16 10:7