Simp:
The belt in question appears to have many, but not all, of the characteristics of the US Model of 1917 Enlisted Man's Garrison Belt. The key identifier on these belts is the single line of grommets in the center of the belt. It is intended to carry two, five round pouches of .30-06 ammunition in stripper clips, and a hanger that permits mounting of the bayonet and sheath.
The inconsistent features of this belt are the shiny, stainless steel like appearance of the metal, the absence of the usual markings and the ribbed style of belt keepers which were not seen until years later. The rivets/fasteners that affix the female end of the belt are also non-standard as these belts typically had the end sewn. Accordingly, in my view this is likely a reproduction or foreign made belt, or both.
I hope that this discussion is helpful to you.
Charlie Flick