Need Help To ID Power Transformer

I have a tranny that was in a tube guitar amp that is NOT original to the unit. At the time (Late 70's) I worked in a stereo repair shop and the owner slapped this tranny in the guitar amp and it worked. It still does but I don't have the specs. I suspect it came from a Stereo Tube unit ala Fisher, Scott, Dynaco, etc. which where still popular, at least for repairs, at the time.

I am trying to find out who made it and what the specs are so that I can use it for another project.

Stamped on the bottom of the unit in white is:

TX781-115C
and just below that:
1005622 also in white.

The wires are NOT cloth.
They are as follows:
Black and a Black/White tied together
Black
Black/Red
Red/Yellow
2-Red
1-Brown
1-Yellow
1-Green
1-White

Do any of you Tube Guru's have any idea what this is or where I can find some info on it? So far I've had no luck with on-line searches.
Thanks,
Brian