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A chronometer is the NE PLUS ULTRA of portable timepieces. They are used as master timepieces for navigation particularly the nautical kind. They were evolved in the eighteenth century following the lead of John Harrison, (see who invented the Chronometer) designed for superior accuracy under the widest variable operating conditions. There are specialized variations in this sphere of timepiece structure. Hamilton had a special type of one-way detente (This may be what you are thinking of) in any case this particular type of movement must always be SET FORWARD. (bACK SETTING) for such purposes as returning to standard time are done in forward motion, maybe two or more l2-hour cycles around the dial, but in forward motion. One can actually cause damage to the movement setting one of these back(and your wallet or expense account)! This harmonizes neatly with the Hamilton slogan (noloiger used) Jamais Arrieres- never backwards! It strictly applies to the Chronometer movement and a similar device on Lever set Grade 992 watches. Don't listen to me!!!!

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