Found at an estate sale.

MARSH INSTRUMENT COMPANY, Skokie Ill,  Made in USA

Untested.  Some signs of age as it is old.  It has the really cool crescent moon dial.  Missing glass.

2 1/8" across.  The threaded connector looks to be 1/2" across.

I will be selling more vintage and antique gauges all from the same collection.  Please see my other listings.

WHEN IS THE NEXT TIME YOU WILL FIND ONE OF THESE!

Location D3