Heavy and remarkable, reference 658 was at the time of production one of Patek Philippe's most complicated serially produced openface pocketwatches. The model is extremely rare. To date, no more than a handful of examples have appeared on the auction market. Chiming with great tone clarity, this minute repeating perpetual calendar timepiece is also fitted with a split seconds mechanism, considered to be one of the most complex complications to master.

The incorporation of these three complications reflects Patek Philippe's mastery and horological know-how.

Launched in 1937, reference 658 features a large stepped case, which was incredibly modern for the period. Interestingly, the Arabic numerals and leaf hands are similar to those of Patek Philippe's iconic reference 1518.

Having resided in an important private collection for close to a decade, this example is preserved in excellent condition, boldly displaying contrasting polished and brushed finishes. Two crisp hallmarks are punched on the inside rim of the case, hidden by the case back as not to disrupt the appearance of the watch. The hard enamel printing is raised and the dial is preserved in overall pristine condition with hardly any tarnishing or spotting, which is particularly impressive considering its age.

The superb condition of this timepiece combined with its ultra complicated movement make the present "grande complication" a rare and important piece to have for the discerning collector.