This is an image showing the various shapes of pit checks to be found. Apart from three or four tub motties, all the checks are from the Yorks coalfield.
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As pointed out, the check was the miner's personal number for the time they were employed. When a man left the pit, it would eventually pass to a new employee. When you collected your wage you quoted your check number (or sometimes used a pay check) Hope this helps...
Regards, John...
Huddersfield, best value for money in the country, spend a day there & it'll feel like a week........