Original Wood Place King of Boxer arcade game circuit board. This particular board is untested, but we're guessing it doesn't work as it has a broken cap and has been sitting for many years. We believe the game play is the same as Ring King (board has Data East labeled Ring King roms installed), but the pinout is not the same as Ring King, so we can't test it.
Board is sold as-is, probably needing repair, see pictures for more details on its condition. Aside from a bit dusty and a broken cap, it appears to be complete.