@StaryWilk Proszę bardzo - nietypowy (true second - sekunda skacze jak w kwarcu) "grozi" tym, że być może tylko serwis go ogarnie, pewnie będą problemy z częściami.
Zobacz, że rolex tru beat (ref. 6556 i 6558) niedługo był w sprzedaży.
Unlike the more common Cal. 1030, the 1040 featured dead beat seconds similar to the motion of a quartz timepiece, affording increased accuracy and precision in medical applications. The rub with this movement is just how short a production run it had and how few parts were available for it in the following years. This resulted in many Tru-Beat movements being swapped for more conventional counterparts, making examples with the original movement fitted, like this one, considerably more desirable than the rest.
Żródło: https://www.hodinkee.com/articles/a-fabulous-rolex-tru-beat-a-classic-heuer-auto-rallye-and-a-remarkably-clean-omega-pulsations
The Tru-Beat unfortunately had a short life because the additional dead second device was complicated to replace in case of failure, knowing that the movement beats at 18,000 beats per hour and the dead second needs nearly 3,600 beats per hour; and works all the time. Effectively this meant that the Cal. 1040 had to be serviced frequently and was often adjusted to be like a normal 1030, without the ‘jumping second’. Overall, the above and also its short-lived life is why today the Tru-Beat is one of the rarest and the most curious Rolexes ever produced.
Żródło: https://montrespubliques.com/1minute-reads/the-golden-age-of-swiss-fine-watches-rolex-6556-tru-beat