Okay, so the world of chronographs is where things get really interesting to me. First of all, I just love chronographs in general, and second, vintage AP chronos are leaps and bounds ahead of their competitors in so many ways. First, lets look at general rarity. Let's take for example how many Patek Philippe 2499s were made over some 35 years: 349. That is 349 of arguably one of the finest wristwatches ever made, right? For sure, and there are four different series of 2499, so these pieces are rare, certainly. But, consider the fact that Audemars Piguet as a whole, in the vintage era, made at most 300 chronographs, all in. That includes the early mono-pushers, the later two-button guys, the pieces worn by French Lieutenants, the oversized pink golds, the 36 mm triple registers – everything – and they are all so different from one another. Vacheron's family of chronographs are clearly defined, as are Pateks, but AP's aren't. Almost anything is possible, and at any given time one could find a Patek 1463, 130, or 1579 for sale. The same goes with a Vacheron 4032 or 4178 – if you really wanted one, you could find one. With AP, you just can't (believe me on this one, I've tried). When AP chronographs come up at auction, people pay attention, and for the special pieces, anything goes.