It's a 3902 board, with a simm MM II sound board.
Let me just toss in a little info. Some game sets will only have 1 or sometimes 2 PXL simms ( The game set you have pictured has 3 ) Also some game sets will have 4 Game eproms ( chips) In your picture you have 2. If you ever run across a set with 4 Game eproms, game 3 will install in socket U 14 and on the board it's marked as PXL 1 Game 4 installs in socket U 30 and is marked as PXL 2.
Game King 5.3 has (1) base chip, (4) game chips, (1) CGF simm ( installs below the sound board ) (1) PXL simm, and (1) sound simm