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July 23, 2021

Vacheron Constantin: American 1921 Pièce Unique

Enriched by a heritage based on the transmission of watchmaking expertise and stylistic research through generations of master artisans, Vacheron Constantin continues to celebrate the 100th anniversary of the American 1921 by recreating this emblematic model from scratch which was produced in only 24 units. From the 11-ligne Calibre Nouveau to the gold case along with the decorations and exterior components, the American 1921 Pièce unique watch reproduces the original properties of its ancestor created a century ago

Vacheron Constantin American 1921 Pièce Unique

This highly complex and unprecedented process involved the most experienced watchmakers in the Restoration workshop and the Vacheron Constantin Heritage team, who spent a year reviving old tools and forgotten know-how. The result is an exceptional one-of-a-kind timepiece, a symbol of the Maison’s attachment to its heritage and to the continuous enrichment of traditional know-how. 

MACHINES AND TOOLS

In order to reproduce the hand-crafted operations performed back in the day, artisans had to work with some historical tools from Vacheron Constantin’s Heritage. A late 19th century facing lathe enabled them to faithfully recreate the elements composing the case; a rounding-up (topping) tool from the latter half of the 19th century served to modify the profile of wheel teeth and to adjust their diameter. Watchmakers used an 18th century upright drilling accessory to drill through the movement’s mainplate. To drive the jewels into their settings, they resorted to an early 20th century staking tool. 

These vintage machines were complemented by tools specially made for this project, such as custom-made milling-cutters and riveting tools in line with those of the early 20th century, enabling the artisans to work in a manner attuned to that period and closely reproducing the operations and development techniques of the time. The result of this remarkable stylistic exercise is an exceptional collector’s item symbolising Vacheron Constantin’s unwavering commitment to the transmission, enhancement and continuous enrichment of its production skills. 

THE NEW VINTAGE MOVEMENT

While the watchmakers in Vacheron Constantin’s Restoration workshop fully master the art of bringing back to life the most exceptional timepieces produced by the Manufacture in the course of its long history, never before had they been called upon to rebuild a vintage calibre from scratch. 

Vacheron Constantin American 1921 Pièce Unique

They began by disassembling and examining every single component of the original 11-ligne Calibre Nouveau powering the original model. Apart from the bridges and mainplate which had to be recreated, the Restoration workshop’s stocks proved to be a goldmine for the artisans who thereby had access to all the necessary blank parts. This involved extremely laborious research, since a vintage case could contain an infinite number of components, all different in terms of size and shape. In order to identify them one by one, the first stage consisted in taking the measurements and dimensions of each of the 115 components of the original movement. This meticulous work of observation and comparison subsequently led watchmakers to make plans and mock-ups of the calibre, a particularly delicate task requiring extremely complex sizing calculations.

At this stage, the archive documents safeguarded by the Heritage department proved extremely valuable, notably in recreating the bridges and the mainplate according to the specificities of this vintage movement. How could each component be adjusted and calibrated prior to assembly? How should the vintage machines be regulated? How could the jewels be set on the movement, whereas they are now generally driven in? How could the exact colour of the gilding on the wheels be achieved? At what distance and at which height should they be placed in order to be faithful to the original calibre? These were all issues that the watchmakers had to resolve by assembling the components one by one, as any potential error could jeopardise the entire project. 

Vacheron Constantin American 1921 Pièce Unique

Setting the jewels on the movement was also a real tour de force. Since the 1940s, it has been customary to drive in the jewels, and while the watchmakers in Vacheron Constantin’s Restoration workshop are accustomed to replacing damaged jewels on very old timepieces, until now they had never had the opportunity to make the settings themselves. Successfully hollowing out the metal to the exact depth required to fit the stones to the nearest hundredth required multiple trials. Not to mention the patient research work required to develop the system for reproducing the unique ribbed pattern which, alongside various manual engravings, adorns the movement in the same way as was done at the time. 

CASE AND DIAL

Accurately reproducing the exterior of the American 1921 also represented a real feat of manual workmanship. Here again, Vacheron Constantin’s watchmakers had to provide answers to numerous technical questions by observing the 1921 timepiece in minute detail, while comparing it with archive documents, and then individually crafting each element of the case and dial. 

Some period components were available in the stocks of the Restoration workshop, such as rough blanks of the crown and hands. Others had to be entirely recreated, starting with the 31.5 mm case, according to the dimensions of the original American 1921. It was crafted by a Restoration workshop goldsmith from the specific gold alloy used for the historical model (18K 3N yellow gold), identified with the help of a spectrometer in order to reproduce its exact colourOnly a laser engraving applied to the case back, for customs purposes, distinguishes the American 1921 Pièce unique watch from its ancestor

Vacheron Constantin American 1921 Pièce Unique


The creation of the dial also called for highly specialised expertise on the part of the artisan responsible for restoring the grain and unique beauty of the original dial. Crafted in Grand Feu enamel, an ancestral technique considered to be one of the most delicate in the field of watchmaking ornamentation, it required numerous firings in the kiln at a temperature of over 800°C. It features vintage numerals and logo, along with slender open-tipped hands that have been hand-blued by the Restoration workshop using the production techniques of the time. 

Vacheron Constantin American 1921 Pièce Unique

And since no detail is left to chance, the exercise in style has continued right the way through to the end of the strap, whose pin buckle in 18K 3N yellow gold (the same alloy as the original model) was also produced in the Vacheron Constantin workshop. 

Vacheron Constantin American 1921 Pièce Unique

The American 1921 Pièce unique will be in the spotlight throughout 2021 through prolonged exposure in Vacheron Constantin boutiques around the world

Vacheron Constantin American 1921 Pièce Unique