Audemars Piguet "extra Plate", ref. 5633 BA, sold in November 1961

Record summary

Catalogued by Antiquorum auction archive, Geneva (lot Lot 381-77), this is a pocket watch by Audemars Piguet, made in Switzerland, dated sold in November 1961. The Atlas places it in the Modern Mechanical Horology period (1945 – 1969) of its Pocket Watches collection. Materials and techniques recorded by the source: 18k yellow gold. Recorded dimensions: 42 ; weight 50 gr. The record is illustrated with 2 photographs.

Assembled from the source record's structured fields. Dates and attributions are given as the source states them; where a field is missing the Atlas leaves it blank rather than estimating.

Catalogue description

Atlas type guide

Pocket watches

The pocket watch was the dominant personal timekeeper from the late seventeenth century until the First World War. Its development tracks the history of the escapement: verge watches with fusees until the late eighteenth century; Thomas Mudge's lever escapement (c. 1755) and the cylinder escapement popularised by George Graham and later by Swiss makers; and the Swiss and English lever watches of the nineteenth century. Lépine's bar-bridge calibre and keyless winding made watches thinner and easier to use.

Industrialisation transformed the trade: American factories such as Waltham (from 1850) and Elgin produced interchangeable parts by machine, and Swiss makers responded with their own mechanisation after the 1876 Philadelphia Exhibition. By 1900 a reliable watch was affordable to millions; the finest makers continued to produce complications and precision watches.

General guidance written by the Atlas editors about this kind of object. It is not a statement about this particular piece; for that, rely on the source record above and on physical examination.

Read next:Verge escapementDetached lever escapementFuseeIdentification Centre