Type 15: AE3. CONCORDIA AVGGG
Roma seated front, head left, holding globe left (in her right hand, on the viewer's left), and holding partly-seen reversed spear (in her left hand, on the viewer's right).
378-383
Types 15, 16, and 17 are very similar. If the globe is left, it is this type. If the globe is right, it is Type 16. If there is no globe and the figure is facing, it is Type 17.
Type 15 is common for Gratian, Valentinian II, and Theodosius. 12 Mints.
Gratian
18 mm. 2.94 grams.
RIC Antioch 46a
[More images below on this page]
This type is often not distinguished properly from Type 16, which has the same legend and general appearance, but head and globe right. For example, RIC Her 16 says "Roma's head right, foot on prow" which makes it Constantinopolis as type 16. Also, RIC Con 56a (page 227) says "? [sic] Constantinopolis, seated facing, head l., holding globe and partly seen spear, r. leg bare." Since the leg apparently does not rest on a prow, I would attribute that as Roma and therefore Type 15 (this type), not Type 16 which has Constantinopolis seated, head and globe right.
Cayon G-67 (1 photo, but of type 16, Ant), V2-57,59,71 (3 photos, Sis, Cyz, Ale), T-59 (2, Sis, xx).
Hunter G-83.G53 (Nic), G-83.G55 (Ant); V2-84.32 (Sis), V2-84.50 (Ant); T-86.44 (Nic)
More images:
Gratian:
Valentinian II
Valentinian II
18 mm. 2.24 grams.
RIC Siscia 27
Theodosius
Siscia. 18mm. 12:00. 2.29 grams.