A,W, Wheaton owned Weaton Brass Works and was well known for holding many patients on the inner workings of transfer tank trucks.
Could of been used on trucks , although they did produce some service station equipment. Knowing the flap spring loaded trigger you have on nozzle it makes sense that it was used maybe on truck that filled heating,lighting, and cooking oil for house holds using smaller tranfer cans.

Yes I know NO Help right.

*Wanted Pierce Pennant Petroleum*