Careful now, that could be a McGraw-Edison version with the shallow refractor.

Also don't the LM ones have the PC socket further back? The older Unistyles have their PC sockets practically "falling off" the back end of the fixture.

Not really, this style housing was used by both McGraw-Edison AND Line Materials. The only difference being the refractor design. The LM continued using the deep bowl refractor whild McGraw-Edison used the shallow.

seriously? are you saying those 2 companies existed the same time making same fixtures?! I always thought McGraw-Edison took over the Line Materials?

They did, but mid-60s L-M versions also utilized the final housing design with the exposed two bolt slipfitter and moved-up P-cell. Again, the only difference was the refractor design.

What about the 70s?

Line Material was the Crouse-Hinds equivalent of Cooper to McGaw-Edison.

confused.....LOL

McGraw-Edison is now owned by Cooper....but wait a minute, Crouse-Hinds also bought Westinghouse, which eventually became Cooper, but yet Cooper....

hmmmmm my mind is spinning.....

Somebody needs to make a tree or a chart of how this became that and how it went...

In the 70s the Unistyle was discontinued in favor of the Unidor.

Line Material --> McGraw-Edison --> Cooper (Cooper bought McGaw in 1985)
Crouse-Hinds --> Cooper (bought Crouse-Hinds in 1981)
Westinghouse --> Cooper (bought in 1982, a year after they bought Crouse-Hinds)

Crouse-Hinds didn't buy Westinghouse. Cooper bought Westinghouse after they bought Crouse-Hinds and used the Crouse-Hinds brand to sell the street lights under, as they didn't have the rights to the Westinghouse name (Philips did).