ROLEX "Tru-Beat", ref. 6556, around 1956. Steel round case, diam. 35 mm, n. 138670 (very good condition). Brown dial with applied indexes, (very good condition, original). Automatic movement, with "dead seconds", cal. 1040, n. N823345, (very good condition). Bracelet Rolex USA with finals ref. 60. Dial, case and movement signed. The movement to "dead seconds" is very rare; it is independent of the main mechanism and allows the second hand to advance by one second every beat. It was used for scientific purposes, to measure the seconds accurately.
Starting price: € 7'000