A grail watch for many, the 2499 is often seen as one of Patek’s finest. It pairs a chronograph with a perpetual calendar and a sheer timeless design – arguably more so than its predecessor 1518 as well as its successor 3970.There are generally four versions of the 2499 to be distinguished:- first series: square chronograph buttons, applied Arabic numerals andtachymeter scale (1951-1955)- second series: round chronograph buttons, either applied baton or appliedArabic numerals and tachymeter scale, such as the watch pictured (1955-1960)- third series: round chronograph buttons, applied baton numerals and outerseconds divisions in 5′ increments (1960-1978)-fourth series: round chronograph buttons, applied baton numerals, outerseconds divisions and sapphire crystal (1978-1985)
