[Shop-talk] Old wrench sizing system

[Doug Braun <doug@dougbraun.com>]

Hello,

I bought an old open-ended wrench at a flea market.
One end was 1", but was marked "3/4 (X) C".
The other end was 1-1/8", but was marked "7/8 (X) C".

The "(X)" is actually a hexagon.

Does anybody know what this sizing system is?

Thanks,
Doug
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