Here's a FEL TEMP with the studded boots. You can also clearly make out the wrapped leggings of the captives.
Constantius II
A.D. 348-351
20mm 4.6gm
D N CONSTANTIVS P F AVG; diademed, draped & cuirassed bust left, holding globe.
FEL TEMP-REPARATIO, Emperor bare headed and in military dress standing left, holding labarum in his right hand, resting left hand on shield. Two bound captives standing and leaning to the left before him.
In ex. SMNB
RIC VIII Nicomedia 67