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I can only say that it will be a Whitworth size.I play more with Triumphs.
7/16" Whitworth = 0.812"-0.820" across flats.
1/2" Whitworth =0.912"-0.920" across flats.
9/16" Whitworth =1.000"-1.010" across flats.

Do any of those sizes look close?
 
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