old northern telecom phone

[poplar1]

What other markings should i look for on outside of this 500 phone to determine if it's  a Kellogg  phone. I would have to ask seller to send more photos

The "Kellogg" name should be on the housing (behind the cradle) and on the handset. Also, the ink stamps on the baseplate (outside) are different on a Kellogg compared to WE or NE.

[long jumper]

Thanks for your input. I contacted seller they they said they would look at phone and let me know if Kellogg stamp was where you said they were. That was 3 days ago. Living in western  pa i have rarely seen any Kellogg 500 phones

[HowardPgh]

The handset looks WE. The Kellogg version handset looks generally the same but has rounder shoulders.
Its possible that it may have a Kellogg case.  Also could be a 591 which was sold to the Independents with no ringer. Bentleyville PA and party code on dial card may indicate a frequency ringer inside. The Kellogg 500 I have has the components fastened with nuts and bolts rather than being riveted to the base.