MG Industries Gas Pressure Regulator 0-4000 psi.  I cannot read the tag that gives the model number but one of the gauges reads 4000 psi, and the other reads 200 psi.  Please see photos for conditions and possible usage. 

I purchased this from a government facility.

Tag: C-P4515

Bin: 19H-NACLE

Shelf: 3.9