Constantius II FEL TEMP horseman from Heraclea with unusual shield decorations

[Victor]

The shield on the ground dropped by the barbarian has an unusual design. It looks like two perpendicular lines intersected by two horizontal lines. Just a small detail, but I thought that it was neat.

Constantius II
A.D. 351- 355
24mm     5.1gm
D N CONSTAN-TIVS P F AVG; pearl-diademed, draped and cuirassed bust right.
FEL TEMP RE-PARATIO; Soldier spearing fallen horseman, Γ in left field.
In ex. SMHΓ
RIC VIII Heraclea 82