Date of the Chatsworth Relief?

[Tarbicus]

Can someone tell me the date of the Chatsworth Relief (Hadrianic/Trajanic?), showing the soldiers working in tunics?

I just noticed:
A - They don't have baldrics holding up their gladii.
B - They do have straps going from over the left shoulder, under the right armpit, and back up to their left shoulder to gather in their tunics on the right side.

If they're 2nd-C (very short aprons, or they're wrapped around the belt to keep them out of the way) then it looks a viable option to hang your gladius from your belt. Have these straps been assumed to be sword baldrics? I'm looking at them and they're most definitely not.