Type 3: AE1. RESTIVTOR REIPVBLICAE
Emperor standing facing, head left, holding standard and Victory on globe.
364-367
Struck for Valentinian I, Valens, and Gratian.
It is rare for Valentinian, significantly rarer for Valens, and of extreme rarity for Gratian. (I have never seen one offered.)

Valentinian I
28-25 mm. 5:30. 7.22 grams.
RIC Constantinople 15 (delta) "R3".
| mint | RIC | V | Vn | G |
| Aq | 6 | S | S | |
| Rome | 13 | 4 | ||
| 20 | R | 2 | 4 | |
| Sir | 3 | 3 | ||
| Th | 15 | 4 | ||
| Her | 2 | 4 | ||
| Con | 15 | 3 | ||
| Cyz | 5 | 4 | ||
| Nic | 7 | 2 | 3 | |
| Ant | 9 | 3 | 4 |
RIC photos: Vn-XIV.1 (Ant), G-III.8 (Rome), V-XV.6 (Nic), V-XV.7 (Her).
The dates for RIC Rome 20 are given as 367-375 (pages 120-1).
Cayon V-92 (3 photos, Aq, Con, Nic). Vn-109 (2 photos, Aq, Nic). G--. Hunter --
More images.
Valentinian I:

Valentinian I
27 mm. 6:00. 8.67 grams.
RIC Nicomedia 7a (gamma), "R2".

Valentinian I
27 mm. 5:30. 9.78 grams.
RIC Heraclea 2. "R4"

Valens:

Valens
28-27 mm. 5:30. 8.16 grams.
Nicomedia 7b (gamma) "R3".