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HoudiniHarry said:Rockhunter62 said:If it has a 10mm thread on the inside, it would indicate European being metric.
Cheers
Doug
If it is old it would have a BSF or AF thread I believe.
Cheers
If it is British and before the 1960s it would be a Whitworth Thread. and BSW and BSF, the metric stuff was very rare in the UK until the late 70s early 80s.