In fact, I find myself more and more drawn to simple, pure designs that just work. Editor’s note: The longer I spend around watches, the less I find myself in bells and whistles (Patek alarms and Jaquet Droz excepted). If you wear it during some consecutive days (with this previous manual winding the first time, to ensure it’s fully charged), and it’s still running -15s/day, then it could be magnetized, and you would need to buy a demagnetizer (there are some at ebay for less than 10€), or take it to the TH Service to be demagnetized, or adjusted if the -15s/day were not due to the magnetism. The TAG Heuer Carrera Calibre 5 Day-Date is a near-perfect daily wearer. This will start the watch, giving it sufficient power reserve to function normally. You can recharge it by turning the crown clockwise, unscrewed or in neutral position, (minimum 40 times). “As it is the action of the wearer’s wrist that winds up the movement and maintains maximum power, the power reserve will begin to drain if there is not enough movement, causing the watch to stop. Fuelled by a common history with innovation and motor racing at its core, the TAG Heuer Carrera Porsche Chronograph is a seamless blend of the Porsche and TAG Heuer universes. You can manually wind it if you want to be sure the power reserve is full. Click to expand.You can read in the previous post by Hubert that mechanical watches are not so precise as quartz watches, but your Calibre 5 should be within the -5/+20 seconds per day margin, and your is -15 seconds per day = not normal

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