I have a old BEN Patents Ltd Compressor unit, It has a Century RS P4 motor driving it (which needs attention at the moment). I can’t seem to find any info on it online but I do have a couple of pics for you. The second pic is the motor with the back off.
The last pic is a unit which closely resembles the compressor unit on my setup.
Ben is now Broomwade, looks like a ac 3 model
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