I had a fun mini hunt. I couldn't find anything earlier than 1995 - but I absolutely did not exhaust the search space. The bitmaps for OK/Cancel don't match he

I had a fun mini hunt. I couldn't find anything earlier than 1995 - but I absolutely did not exhaust the search space. The bitmaps for OK/Cancel don't match here: https://www.math.ucdavis.edu/~mkoeppe/mkm/gv210-1.gif https://www.math.ucdavis.edu/~mkoeppe/mkm/gv210-1.gif (From https://www.math.ucdavis.edu/~mkoeppe/mkm/ https://www.math.ucdavis.edu/~mkoeppe/mkm/) I say - still likely.