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The rating appears to be faintly stamped on it.
...
The rating appears to be faintly stamped on it.
For 230V the whole of the primary winding should be used, for 110V the centre tap should be connected and the other half of the winding unused.
The secondary is 12V centre tapped.
It looks like you've guessed correctly, but you should test it to make sure: the DC resistance of the primary should be higher than the secondary.
jesus how hard is it to tell him!!
The black and yellow are for the 230V winding, the 110V is black and yellow joined with the white.
hook it up and test the voltage!!