Rare IN HOUSE Omega Tuning Fork Calibre 1220. 198.0047 / 398.0819. Caliber 1220 15 Jewel COSC certified chronometer.Silver Brush Dial with Silver & Black index hour markers and matched Classic Omega Electric "Stick" hands. Created in 1973 15 jewels Central sweep-second hand. COSC is Contrôle Officiel Suisse des Chronomètres, the Official Swiss Chronometer Testing Institute, which is the institute responsible for certifying the accuracy and precision of wristwatches in Switzerland.
Less than 3% of the Watches produced in Switzerland are COSC certified chronometers. A Fantastic Condition case ALL ORIGINAL even brushed finish with polish finish engine turned bezel again in superb crisp condition.A Large watch at 36mm in diameter excluding crown and 39mm inclusive Original signed crown. 39mm lug tip to lug tip with "hidden" lugs. Screw-down case back with crisp sharp constellation insignia.
Oh do take a look! Over by collectors but dont fall for the. Y polished omegas look at at the lugs. The dog leg lug variants the edges of the case, the insignia to rear.
Beware of the Words "MINT" & "NOS" so often this simply means "Polished" & shiny.. MINT dial again all original.
Brushed Silver Dial with bright steel indexes jet black inset. Classic Omega Two tone "Stick" hands quite synonymous in design with Omega electronic watches of the era. Super Smooth centre sweep seconds.Deep red Applied metal logo the inset in the trapeze again a sign of early Omega electronic watches. Applied metal "OMEGA" Text at 6 all other detail in crisp black lettering. Outlined date aperture at 3. Dial is near ALL Original. THIS IS NOT A REDIAL. (as if we needed to say it).
All of course visible under the Original Crystal small scratch to surface at 9. Rare Omega 1199/199 "Bar Link" bracelet in excellent condition.
Hermetically sealed micro motor with magnetic gear. Without any doubt, this calibre is the most unusual Tuning Fork watch ever made. Its principle of operation is quite different (and yet quite similar) to other tuning fork watches.Like the Accutron 214 and the Swissonic watches (ie the ESA 9162 and 9164) this movement was also designed by Max Hetzel, who left Bulova a number of years previously. This design enabled Omega to bypass any patents held by Bulova. Unlike other tuning fork watches, it does not have an index finger attached to the fork and a pawl finger attached to the watch plate. In fact it does not actually even have index and pawl fingers as such, but two "clicks", each of which act as both an index and pawl finger. The index wheel is different also, as it does not have an axle, pinion, or pivots, but runs on 4 balls, sandwiched between 2 ruby discs, mounted in a small hermetically sealed casing called the Micromotor.
The Micromotor assembly is mounted on the smaller tine of the tuning fork. It is not serviceable, and requires no adjustment. The Micromotor, at only 0.6 mm thick, stands out as being one of the smallest watch assemblies ever made. I think this would be true even today.
So, rotary motion is induced in the wheel. By now you are asking yourself If the index wheel doesn't have an axle, and is in a sealed container, how does it drive the watch? This is the other unique feature of the Omega cal. The index wheel is a disc of polarized magnetic material, magnetically connecting to the coupling wheel below it.
Motion is then transmitted by magnetic gears for the first and second reductions of the gear train. The assymetrical Tuning Fork is another interesting feature of this watch.
Omega says it uses only 75% of the power as would be required to drive a conventional symetrical tuning fork. The electronics are slightly different to what we are familiar with as well. The drive coil is a single winding with no separate feedback coil, and the electronics driving it are contained in an Integrated Circuit, albeit a quite simple one.1220 movement was quoted as having an accuracy of 30 seconds/Month, which is twice as good as other tuning fork watches. This is due to the high frequency at which the fork resonates - 720 Hz. Warning: It is not recommended you dismantle one of these watches without having the factory service data available. The sequence of disassembly and reassembly is very important. In particular, if any of the magnetic gears come into contact with the tuning fork, they will be instantly destroyed. Not only did Omega get around Bulova's tuning fork patent with this watch, they also developed an electronic circuit different to all other Tuning Fork watches as well. The Omega 1220 did not use a feedback coil, as can be seen from the circuit.
Up until now, all tuning fork watches had a feedback coil. This includes the Bulova 230 series watches, which have a similar looking coil shaped like a flat disk, but which in fact contains a feedback coil. We can offer a comprehensive servicing facility we can service most watches at a fraction of the high street cost, we can look after most watches from pocket watches to trench watches to high end chronographs. ALSO our feedback and star ratings are very important to us. We will do all that we can to resolve any issues swiftly and amicably and ensure you get the best.
The item "Omega Constellation 1973 Electronic 398.0819 Rare In House Ca 1220 Tuning Fork" is in sale since Thursday, April 4, 2019. This item is in the category "Jewellery & Watches\Watches, Parts & Accessories\Wristwatches". The seller is "fullywound" and is located in Folkestone. This item can be shipped worldwide.