it seems still to be wired for 110 volts BUT has a guilder coin label on the front, would it be logic for the first arcaades to use some sort of 110 volt mains somehow in stead of rebuilding all there forign cabs?
It's quite normal..... I think you will find that the transformer you are showing there has dual 115V primary coil windings. This allows it to be easily switched from 115V to 230V. There is something of a tolerance on this that would allow it to run on 110V.
It is easily altered from one specification to the other by altering the way that the primary coils are connected to the mains, in either series or parallel configuration. The output voltages from the transformer will then be the same (more or less).
Let me explain...
1) If we connect 230v to the coils with them wired in series, each coil will have 115v on it.
2) If we connect 115v to the coils with them wired in parallel, each coil will still have 115v on it.
The output voltages will be the same in both cases.
Not difficult to do! as long as you understand your basic electrics.
Best Regards,
Julian (Fozzy The Bear)