Is the output voltage specified an end to end measurement? Or is it end to midpoint? Remember that most neon sign transformers are midpoint grounded. Also is the voltage an RMS measurement, or is it the peak voltage, or even peak-to-peak voltage? Also, what conditions are this measurement made under? Is it open circuit voltage? Or is it the voltage while a reasonable load (a neon tube) is attached?
Likewise with the current, is this the RMS, peak, or peak-to-peak current? And is this current measurement one of the short circuit current? Or is it the current when a reasonable load is attached?