Ten years ago, TAG Heuer presented the MONACO V4 concept watch. Based on the classic square-faced Monaco watch, the V4 was a world’s first watch with belt drives, linear mass and ball bearings. The V4 name derived from the V-shaped main plate on which the movement’s four barrels are mounted: 2-by-2 series of ball bearings which are slightly angled give the resemblance of the cylinder set-up on a racing engine. http://www.wristwatchworld.nu/tag-heuer-monaco-v4-tourbillon/

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