Thanks. I thought it was C-H.
Slightly off topic: Does anyone know what happened to the T&B panel line?
It was totally discontinued. There was a supply house near me that carried it and they had it one week and they didn't have it the next.
If I remember correctly T&B stuff was functionally and mechanically identical to the Challenger/Westinghouse stuff of that time period. I still have a handful of T&B breakers and they are exactly the same as a modern Cutler Hammer or old Bryant or Westinghouse.