Omega Speedmaster Perpetual Calendar Yellow Gold / Champagne / Ref. 3650.10.20

The Omega Speedmaster Perpetual Calendar Yellow Gold / Champagne / 3650.10.20 has a 39 mm yellow gold case, and is water resistant to 100 metres.

The Omega Speedmaster Perpetual Calendar is a limited edition of 50 pieces created for the Japanese market in 1991, honoring the 700th anniversary of Switzerland. It is powered by caliber 1160, which is housed in a yellow gold case of 39mm. It was available with either a yellow gold bracelet or a brown alligator strap; though the main image is supplied by Omega, it is believed that this strap is not original.

Diameter: 39 mm
Water resistance: 100 m
Case: Yellow Gold
Released: 1991
Movement: Omega caliber 1160

Specifications

Case and dimensions

Case diameter: 39 mm
Lug width: 18 mm
Case shape: Round
Case material: Yellow Gold
Bezel: Tachymeter
Crystal: Sapphire
Case back: Closed
Water resistance: 100 m

Dial

Dial colour: Silver
Indexes: Stick / Dot
Hands: Stick

Movement

Calibre: Omega caliber 1160
Movement maker: Omega
Movement type: Automatic
Display: Analog
Power reserve: 44 h
Frequency: 28800 vph
Jewels: 27
Movement diameter: 25.6 mm
Complications: Chronograph, Date, Day, Hours, Leap Year, Minutes, Month, Moonphase, Perpetual Calendar and Small Seconds