Thank you. Yes it says Sangamo and Floton on the face of the meter. I’ll look into that too.The meter looks like a Sangamo Floton meter.
I found this on a forum from a New Zealand (basically all the same systems as the U.K) meter calibrator / tester.
The Floton bearing meters 1970's ( Sangamo series ) did not have any major problems at all except Jamming jumping dials.