[K7Sparky]

I've had a handful of Loctal sockets made by Amphenol in Chicago for years.
Just looked at them compared to one of the Philco. Not only is the key lined up with the mounting holes instead of off 90 degrees like the Philco, screw spacing is 0.315 narrower.

The socket Bakelite or phenolic is molded onto the mounting flange.

It would make sense if the older American Phenolic sockets also Chicago became Amphenol. Anyone know? When?

Thanks for the source DeckApe

Have really enjoyed reading along the trail. Had forgotten we used to call that style mica's Domino's