Lot Essay
Reference 3940 is the quintessential perpetual calendar and undeniably amongst Patek Philippe's greatest classics. Launched in 1984 as replacement for reference 3450, it was at the time the slimmest automatic perpetual calendar wristwatch.
The model was available in yellow, pink and white gold and platinum. All case versions but platinum were available with both solid and glazed back.
The model was available in yellow, pink and white gold and platinum. All case versions but platinum were available with both solid and glazed back.