An interesting socket - possibly aircraft?
is it 13/16" ? spark plug socket for hemi engine?
I believe that is a WWII era contract/specialty tool for the Wright Aircraft Co.:
https://www.worthpoint.com/worthopedia/plomb-wright-aircraft-contract-tool-460464994 (https://www.worthpoint.com/worthopedia/plomb-wright-aircraft-contract-tool-460464994)
I have found what I want, it is very point.