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Deadly precise OMEGA mantle clock with independent dead beat seconds (aka seconde morte), Ref. 5502, powered by 8-day precision movement Cal. 59.8D SCS (Ω 120) with large jumping second hand that can be stopped thanks to locking device, made circa 1952. Satin-brushed silvered dial, outer minute circle with strokes, polished and riveted gold Roman numerals and hour markers, polished and bevelled gold Dauphine hands, entirely fluted brass case.
Omega advertising from the 1950s presenting the Synchrobeat dead second mechanism – “Synchronized second hand snaps to a full stop at each seconds, then jumps to the next. It’s an exclusive Omega development – there is no other like it in the world!”. Also advertised as “..the only chronometer clock with 8-day, 20-jewel movement. In design distinguished for home or office, it is a lasting gift, destined to become a family heirloom. With smooth back suitable for personal inscription..”.
C. Square gilt brass, fluted sides D. Satin-brushed silvered dial, outer minute circle with strokes, polished and riveted gold Roman numerals and hour markers, polished and bevelled gold Dauphine hands. M. Cal. 120 (aka 59.8-D SCS), copper-colored, 20 jewels, indirect center seconds mounted on the backplate, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator. Dial and movement signed. Dim. 17 x 18 cm.
An identical clocks are illustrated in “Omega, A Journey Through Time” book by Marco Richon, page 192. The 59 8-D SCS caliber (59 mm, 8 days, jumping center seconds) was patented on the 17th August 1942 (Swiss patent No. 229234), published January 3rd,1944 under the title (in French) “Timekeeper with Center Seconds”.
Clock is in overall great condition 8/10, running and ready to use or gift!