JIS (Japanese Industrial Standard) #1. Very similar to the Phillips #1.
Japanese Industrial Standard (JIS) screws are very common in personal electronics from digital cameras to RC Helicopters. JIS screws are often marked by a single dimple pressed into the screw head.
JIS screws are not designed to "cam-out" or strip the head when overtightened like a Phillips screw, and can be damaged if a Phillips driver is used. JIS drivers can be used in both JIS and Phillips screws with no damage.
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