The Rare JLC Sector Dial Day Date Today we are offering one of the rarest Jaeger Le Coultre watches – the early double calendar watch with French day window and outer date track. The beautiful sector dial remains in stunning original condition with vibrant red outer date track, which is complemented by a red-text day disk and red-tipped centre-sweep date hand. The blued-steel hands are in perfect condition as is the seconds hand in the small seconds dial in the lower half of the dial. The steel case is manufactured from Staybrite steel, an early corrosion resistant steel alloy used by the Swiss matchmaking industry in the 1930s and 40s. First wristwatch ever with an Calender function! Specifications - Dates to the 1930s - Serial 66317 - Cal.412 Uniplan - Staybrite steel 32mm case - Sector dial with red date calendar - First wristwatch calendar watch ever made - Includes a Jaeger-Lecoultre watch pouch Ready to wear !