Oswald - After looking at your latest picture I took an another excursion down the web rabbit hole. lol
There are too many subtle difference between your #5 and the Dodge to make a match I think. Further searching located these pictures in another evilbay ad for an AC Rebuilt Type 421 pump that looks very much more like yours. That one includes a box and the label indicates it would fit 1935-36 Chevrolet's. You can see those details in the attached pictures. Further searches of the box indicated part number "609454" indicates it was a Chevrolet offered exchange rebuilt fuel pump for 1935-36 vehicles.
With your other pump looking like it fits an early 1930's application, I think this may also fall into that time period. Hope this helps narrow it down.
