A model of truly monumental importance, reference 1518 was the first perpetual calendar chronograph wristwatch ever produced in series by any manufacturer. It was introduced in 1941, the archetype of the only line of wristwatches continuously produced by Patek since the 1940s (with references 2499, 3970, 5970 and today represented by ref. 5270). No matter the horological advances or aesthetic refinements of these subsequent references, their basic architecture can clearly be traced back to their progenitor, the 1518, making this reference one of the single most important references in modern horology.

According to research, only 281 examples were manufactured until the reference ceased production in 1954, a remarkably small output for such an extended period of time, motivated by the complexity of the timepiece. Already back then, such a slow production meant that these watches were reserved for the best clients of the firm, leaving many frustrated and watch-less - while this is not unusual today, especially with certain models, this was totally unheard of at the time.

The present representative of this landmark model has a number of features that make it extremely appealing for the “endgame” collector.

Most obviously, it is offered in extremely appealing condition: the case presents full lugs and strong edges, with only minor hints of polishing, a remarkable feature for an 80 year old timepiece. The dial is also in fantastic condition, with all the engraved enameled graphics absolutely vibrant and without losses. Most notably, the tiny details of the signature (comma, accent, underline) are all still present while they are infamous for being prone to disappear with utmost ease.

The long signature denotes this dials as a pre-1948 dial. In fact this is an early and rare dial style for the reference, denoted by the fact that the tachymeter base (in this instance: “1 mile”) lays to the right of 12 o’clock, a detail which is indeed found until circa 1945. Starting from 1943, a dial version with the base on the left of 12 o’clock is also produced, and from 1946 examples with the designation “base 1000” straddling twelve o’clock make their appearance.

A final layer of rarity, appeal and exoticism is given by the Spanish calendar discs: most of these pieces feature French or English calendar discs; to find another language is a pleasant additional detail for the discerning collector of fine timepieces.

Last appeared at auction in this very salesroom in 2020 after having rested for decades in a distinguished italian collection, this horological treasure is sure to be the star of any vintage watch collection.