Those are Erie 70/71 pumps the clamshells are on.

It is my humble opinion that Shell asked Erie to design the 70/71's expressly for use with the clamshells. You hardly ever see photos of those pumps branded as anything other than Shell. Even the Erie literature has artist renditions of Shell pumps.

The tops design is such that the base of the globe and the globe retaining screws are covered when the pump top is completely assembled. This was (in my opinion) specifically designed to stop people from walking off with the clamshells.

Later . . .

Jim

[Linked Image from cruisin66.com]