Technical Old Binks spray gun ID

Hey, Picked up this Binks Gun(?) at Hershey cause its a cool shape and artwork worthy.Seems to have bakelite cover and knobs.Iam thinking it was used on an assembly line type application because of the mounting bracket.Any idier what this really was used for and how old it is??? It reads ATF non-offset gun Binks...... Thanks

 

anyone?

 

I think it's part of the manometer that goes on the side of the spray booth.
Measures how many inches of suction the exhaust side pulls.

 

Is there any patent numbers on it? its hard to read the right side of the bakelite cover.

 

# on main body with the bracket is 10137. # on spray nozzle is 0015. One inlet has air printed on it (not stamped or raised letters).Other has liquid on it.No other #s or letters.Thanks

 

Any idiers???