Making 60Hz from 50Hz

[Refugee]

... strobe it to a neon lamp with a strobe mat for the local mains frequency ...

But surely, it isn't the local frequency that you want to lock it to?

Here's a 'dual standard' version you could print:

That dual standard strobe card looks like it would come out of a box containing a DC servo turn table intended for the international market.

The original turn table we started with is a shaded pole type and if it were supplied with a strobe card it would have been a 60Hz one. What we need is a 60Hz oscillator and an amplifier with the correct transformer for the voltage the motor was made to run on. It would then need a 50Hz card and strobe lamp to set the speed to local UK mains using a trim pot on the oscillator. A quartz clocked counter could be used if you already have one and can't be bothered to print a card.