This is a joystick for Commodore C64 etc.
The Design is based on the widely available ZIPPYY joystick, which is of a great quality.
There are now three alternative top shells:
The original ZIPPYY top has a mounting hole distance of 52mm (square), the "HK-T-8YT" a distance of 32mm and the "50sq-28" a distance of 50mm (a ZIPPYY clone). The light blue lines show, how the distances were measured.
Find some info on the required cable making on my website