[Amps] Transformer identification?

[ad5gb]

Hello,

I posted this a couple of days ago but it never showed up so I'm re-sending the
inquiry.  I have been given a large transformer with the markings.....
 
 644-3509-001
Electran Mfg Co.
     1877

Would anyone have any literature that would help me identify it?

Many Thanks

--
Randall D. DuCharme (Radio AD5GB)

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