OLD Avel Lindberg - help please.

I have an old series Avel Lindberg mains transformer with the label stating that it is:

MODEL: AT CE7079/1

It is centre tapped, shielded, and has dual inputs and outputs - it weighs in at approx 4.6KG (10 lbs 6 ozs).

Nowhere can I find a ref to any pre "Y" & "D" series Avels. Any help in identification will be much appreciated!

Many thanks