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Though some tout the Arithmo as the very first timepiece to incorporate a slide rule mechanism, it in truth followed the release of Mimo's Loga and the Breitling Chronomat. With that said, I'd argue that the Arithmo has a leg up on the rest, thanks to its truly wild design. link Most notably, this reference makes use of a second link convex crystal, which extends over the bezel. This detail is lost when looking at the watch in head on photos, though link at an angle its magic becomes evident.