Only Online Auction

Geneva, Jan 03, 2022

LOT 134

Horological School of La Chaux-de-Fonds
Chronograph, minute counter, calibre Valjoux 23; stainless steel

CHF 1,800 - 3,600

EUR 1,735 - 3,470 / USD 1,960 - 3,920 / HKD 15,300 - 30,600

Sold: CHF 2,250

Stainless steel, manual-winding, “tonneau”-shaped, gentleman’s wristwatch, water-resistant with screwed case-back, the movement protected by a cap against dust and humidity; silver colour dial with subsidiary seconds at 9 and two horological complications:
· 1/5 second chronograph (activated by the two round-shaped push-pieces) with tachometric scale graduated in an Archimedean spiral for 1 000 metres
· Half-instantaneous 30-minute counter (subsidiary dial at 3 o’clock)

Grading System
Grade: AA

Very good

Case: 3


Movement: 3*


Overhaul recommended, at buyer's expense

Dial: 3-01


HANDS Original

Brand Horological School , La Chaux-de-Fonds

Model made by A. Boillat

Year circa 1950

Movement No. unnumbered

Case No. unnumbered

Material stainless steel

Bracelet grey leather strap

Buckle stainless steel buckle

Caliber 13’’’ (based on Valjoux 23 ebauche by Raymond Frères, Les Bioux, Vallée de Joux)

Height 43.4 mm.

Width 36.2 mm.

Signature movement (by the student)


The calibre Valjoux 23 and the Swiss Horological Schools

This calibre – one of the most famous in the history of 20th century watchmaking – has often been used by students of horological schools to complete their learning on chronographs.

Thus, one finds with dials of the Ecole Professionnelle d’Horlogerie (Professional School of Watchmaking) of the Vallée de Joux, the Technicum of La Chaux-de-Fonds but also of the Atelier d’Apprentissage d’Horlogerie (Workshop of Apprenticeship of Horology) of Porentruy (Jura), etc.


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.