Technical Aftermarket gauge identification

I bought the set of gauges for the Stewart Warner green line water temp but looking at these I may look for water temp to match.
They look mid 60’s to 70’s? Are these Hawk? For some reason I thought they were. I looked through old threads but couldn’t tell. If you have a water temperature I’m interested.

 

What does the backside look like? Any numbers or printing on the back?

 

I would guess 1980s generic.....

 

.....waiting for the "don't use an ammeter or your car will catch fire" comments....

 

Not much of anything, tried to catch corners inside but nothing visible.

 

I’m sure Mark Moriarity knows,,,,if they are of any value at all,,,,,he has a whole set NOS still in the boxes,,,,lol !

Tommy

 

Nothing for identification.