Identifying a transformer
It is quite likely the number on your transformer is a number for a custom OEM part and there is no information published.

The "flying lead" is likely the high-voltage output node.  It comes out separately to maintain safe spacing to keep the high voltage from arcing uselessly.

You could work out how the transformer is wired by taking careful resistance measurements from each pair of transformer pins.  And then by reverse-engineering the circuit around the transformer.  

If there is active circuitry (transistors, integrated circuits, etc.) inside, then it seems possible the transformer is driven from a high-frequency oscillator. and one of the windings may be some sort of feedback for the oscillator.