Yes, it is US.....some info here. Not terribly valuable, at least here in the states.
Armorer's Corner - Garand Cartridge Belts
If cheap pick it up these can go from anywhere from 50-60 for ww2 period, common field gear is starting to go up so I would pick it up at any rate where I was going to keep or sell it
Its about 10$
Ammo belts are going for $20.00 and up now.
For $10 it is definitely worth picking up