It is possible they were GTE. GTE's clone of AT&T's manufacturing arm
> Western Electric, was called "Automatic Electric" and GTE pay phones
> were beige; I never saw any other color.
Automatic Electric sold equipment to a variety of "independent" telephone companies, not just GTE.
Anyway, Western Electric did make beige and green pay phones.
It's pretty easy to spot an AE vs WE telephone set: Western Electric phones have the finger spot at the 3 o'clock position while AE phones have it at the 5 o'clock position.
[TELECOM Digest Editor's Note: Plus which, on (at least the older) AE rotary dial phones, the dial would return 'faster' when you removed your finger. WE dials pulsed and clicked their way back. PAT]