And on the 2nd wrist my GA- 2110 ET. Btw; does anybody know why this one is 2110 while all the others are 2100?

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The 2100's are single or mixed coloured resin cases. The 2110's have a two tone case/bezal, ie, your grey version has a darker grey bezal, lighter grey case. The mustad one has a black bezal and the dark blue one has a stone colour bezal.

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