Well got a e-mail from Allanson:
Hi Mark, we no longer carry this ballast but I manage to find some specs and I hope this will help
RM-175-B-1 line current amp imput watts open circuit voltage
1.83 210 330
Didn't really answer my question if actually was a M57 ballast and suitable for a Probe type bulb so phoned them, didn't get anything more.
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