large oxygen and acetylene gas regulator and valve set with 2-3/4" gauges

Description

Set of oxy-acetylene regulators for gas welding. Larger set with regulators about 3" in diameter and gauges nearly 3" in diameter.
These look OK but I am not able to test them.
There is not a hint anywhere on them to indicate where they were manufactured or any brand name so I assume they are red chinese.