Gratian, Siscia This type is occasionally found in Spain cut in half. See the "all images" page for two such halved coins of Valentinian II.
RIC photos: MM-III.15 (Tr), T-IV.16 (Lug), V2-XIV.13 (Ant), V2-XVI.1 (Con [low grade])
Cayon G-64 (2 photos, Lug, Th), V2-52,53 (3 photos, Aq, Sis, Ant), T-56 (2 photos, both Sis), MM-16 (2 photos, Ar, xx).
Hunter G-82.16 (Lug), G-82.25 (Ar), V2-84.24 (Aq), V2-84.29,30 (Sis), T-85.14 (Rome), T-85.18 (Aq), T-85.26 (Sis), MM-87.10,11 (Lug), MM-87.15 (Ar).