Perpetual Calendar Chronograph 2499

A grail watch for many, the 2499 is often seen as one of Pateks 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 and, tachymeter scale (1951-1955), – second series: round chronograph buttons, either applied baton or applied, Arabic numerals and tachymeter scale, such as the watch pictured (1955-1960), – third series: round chronograph buttons, applied baton numerals and outer, seconds divisions in 5 increments (1960-1978), -fourth series: round chronograph buttons, applied baton numerals, outer, seconds divisions and sapphire crystal (1978-1985)