The Patek Philippe chronograph reference 591 lives in the shadows of its more famous brothers, the reference 130 and 530. However, in my opinion it is no less interesting, as it offers a very different case shape with thinner lugs, and was produced in low numbers. Less than 100 examples were made between 1938 and 1954, making the 591 one of the rarest chronographs from Patek Philippe. Of those, it seems that 2/3 got rose gold cases, but only a fraction were originally fitted with rose gold dials, as is the case with the example here. As such, it is a real auction piece; unsurprisingly Christie’s just auctioned a similar reference 591 in Dubai. Importantly, the seller provides a Certificate from Patek Philippe, which confirms that the rose dial was present from the birth of the watch in 1941. The condition of the case is another crucial thing to check, as the thinness of the lugs is unforgiving to excessive polishing; here, you can still clearly see the gold hallmarks, which could not be better news.