Omega, “Constellation, Marine Chronometer, Megaquartz, f2,4 MHz”,
Ref. ST 198.0074 / 398.0836.
Watch No. 3705XXXX, .
Case. Two-body, polished and brushed, 14K gold bezel secured with four screws, corrector on the band for the seconds, hooded lugs, plate with movement number on inclined side at 6 o`clock, back secured by four screws, sapphire crystal. This case is in excellent condition with no dent or deep scratch. some light mark from bracelet at bottom and top of case and the original integral Omega "lobster" bracelet with deployant clasp.
Dial. Black, white baton indexes, outer minute/seconds divisions on a raised plateau, date aperture. Tangerine “baton” hands with luminous inset, white center seconds hand.
Movement. Cal. 1511, 13 jewels, with quartz standardization.Very fine,rare, and exceptionally accurate, large, rectangular, dead center seconds, with date, independent hour adjustment
Dimension. 32.5 x 48.8 mm. Thickness 12.4 mm.
The Megaquartz 2400 or f2,4 MHz is regarded as the world`s most technically advanced wristwatch. It is precise to less than one second per month, which makes it about ten times more accurate than an ordinary quartz watch. This precision stems from a specially-designed tiny disc shaped resonator, which is sealed in a capsule and vibrates to the amazing rate of 2,359,296 times a second. The title of “world’s most accurate wristwatch” was bestowed on the watch after 63 days of rigorous testing, resulting in a mean variation rate of no more than 2/1000ths of a second per day, or 0.73 seconds per year.
Moreover, the watch is equipped with a time zone and seconds adjustment device. This allows for independent hour adjustment, thus not affecting the minutes or seconds. With the seconds corrector in the band the watch can be set to the exact second according to the official time signal.
The Megaquartz 2400 was developed in cooperation with the Battelle Institute of Geneva. The first prototype, using caliber 1510, was presented at the 1970 Basel Fair. The watch was launched two years later in its standard version with caliber 1510 and in 1974 as a marine chronometer, with caliber 1511. Caliber 1511 was launched in 1972 and was produced in only 1000 examples. It is so precise that it was awarded the title of “Marine Chronometer” from the Astronomic and Chronometric Observatory of Neuchâtel.