Only Online Auction

Geneva, Apr 07, 2021

LOT 222

Ref. PE 5700, quartz chronometer table clock, centre-seconds, date; “Electroquartz”; Cycolac resin

CHF 1,800 - 2,800

EUR 1,650 - 2,600 / USD 1,950 - 3,100 / HKD 15,100 - 23,500

Grey colour acrylonitrile-butadiene-styrene (ABS) thermoplastic Cycolac resin, quartz, chronometer table clock, dark grey colour dial with radial Roman numerals, dead / jump centre-seconds and one horological complication:
· Instantaneous date of the month (aperture at 2 o’clock)

Click to full view

Grading System
Grade: AAA


Case: 3


Movement: 3*


Overhaul recommended, at buyer's expense

Dial: 3-01


HANDS Original

Brand Omega, Bienne / Biel

Model “Electroquartz”

Reference PE 5700

Year circa 1970

Case No. unnumbered

Material Cycolac resin

Length 100 mm.

Caliber 1390, quartz with integrated circuit, 8 192 Hz; four batteries (type AA)

Height 98 mm.

Width 140 mm.

Weight 880 gr. (approx.)

Signature dial and movement


Omega, “Electroquartz”

In addition to the first quartz watches with a Beta 21 calibre, Omega develops around 1970 a quartz clock with a frequency of 8 192 Hz; this is the first quartz clock produced by the Bienne / Biel-based company. It uses a thermo-compensated quartz bar and an integrated circuit.

The clock will be produced in a very small number of pieces, with a movement called “Calibre 1390”. It indicates the time and date and has a lever that allows the seconds to be set manually without interfering with the operation of the clock. It works with four AA batteries (originally recommended with Mallory, RM-15 or ZM-9 mercury batteries, 1.4 volt each) and has an accuracy of approximately 12 seconds per year!

The clock is housed in a grey acrylonitrile-butadiene-styrene (ABS) thermoplastic Cycolac resin case. Due to the size and complexity of the movement, the clock was quite bulky and weighs more than one kilo.

Very few examples of these clocks are known, apart from those exhibited at the Omega Museum in Bienne / Biel and at Swiss Time Services in the UK; there are less than ten examples in private collections.


The purchase price payable by a buyer will be the sum of the final bid price plus the buyer’s premium, together with any applicable sales or compensating use tax. In addition to the hammer price, the buyer’s premium is payable as follows: 25% of the hammer price on each lot.

Important notice – Special conditions Please look carefully at all the photos as they are an integral part of the description. Any defect not mentioned in the descriptions but visible on the photos will be considered as described and cannot lead to any claim. The dimensions are given as an indication and may slightly differ from the measures mentioned by the manufacturers especially for contemporary watches. The photos are not retouched. Colors may differ from reality. For timepieces, we guarantee neither the functioning nor the precision of the movement, nor the water-resistance of the case. In addition, please note that movements, parts of mechanisms or cases may be incomplete. The lots are sold “as is”, described to the best of our knowledge and cannot be returned. Once the online bid is placed by the bidder, it cannot be cancelled.