This is a replacement circuit board for one row of LCDs on a Mastermind GT/10. GT/16 or GT/22. This can replace any row except for the top row (the one with the large LCD in the middle).
PLEASE NOTE: The backlight colors of these LCDs may not match the color and brightness of the LCDs found in older Mastermind GTs. The LCDs have changed several times over the years. Aside from the possible color mismatch, this circuit board will work correctly in any Mastermind GT.