The big open end is 1/2". That truncated jaw would be to give the wrench a sort of 'ratcheting' action. The box wrench and the small open end are both 5/16". It appears that one of the small open ends was filed to make it 11/32".
These remind me that I have quite a collection of little specialized spanners. I should hang them on a toolboard and free up some drawer space.
Note:
[1] Isn't 'Acme' the outfit that Wile E. Coyote gets all his failure-prone gear from?
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