MTD-1079 showing the Illuminator function. This is the first time I see a Casio watch with two LED's: one on top of the 12 and one bellow the six. The effect is
Custom CASIO Diver MTD-1079 (5373) Illuminator 100M WR 47mm Watch - Need Battery
Watches for a tank of gas - Casio MTD 1079 - YouTube