But Patek did a good job of retaining that classic look in later models, as the reference 3970 and 5370 we've included show ...

"Of the five references of perpetual calendar chronographs made by Patek Philippe – references 1518, 2499, 3970, 5970, and 5270 – the 2499 is sort of the "Goldilocks" or "just right" reference ...