[Amps] Trans question

[StephenTetorka@cs.com]

Hi all:

I have a filiment xmfr having markings that I am not familiar with:

Primary 
top row: +10   -10   240
just under that:  0   208

Secondary
0    CT   5

Might someone kindly explain the meaning of the primary notation.

Tnx,
Steve
WA2TAK