Perpetual calendars

A calendar that accounts for months of different lengths and leap years without manual correction. Watchnik lists 10 perpetual calendar references across 10 models, from 40 mm to 44.1 mm.

Four perpetual calendars on navy, led by the Breitling Navitimer B19, with IWC, Chopard and Jaeger-LeCoultre — Watches shown: IWC Big Pilot Perpetual Calendar, Chopard L.U.C Perpetual Chrono, Breitling Navitimer B19 Perpetual Calendar, Jaeger-LeCoultre Master Ultra Thin Perpetual. Photographs: IWC, Chopard, Breitling, Jaeger-LeCoultre and their authorised retailers.

Models: 10
References: 10
Seiko: 9 models
Patek Philippe: 1 model