Omega Speedmaster Mark 40, 39mm, Calibre 1151 Automatic Chronograph, 3520.50

The OMEGA Speedmaster Day-Date Mark 40 Ref. 3520.50 is one of the more distinctive and functionally accomplished variations of the Speedmaster, combining the collection's celebrated chronograph heritage with an automatic movement and triple-calendar display. Featuring a highly detailed black dial, compact 39mm stainless steel case, tachymeter bezel and stainless steel bracelet, the Mark 40 offers considerably more functionality than the traditional Moonwatch while retaining unmistakable Speedmaster character.

The sophisticated dial incorporates day and month apertures at 12 o'clock, a central pointer date, chronograph registers and a 24-hour indicator, creating an information-rich yet characterful display. Its relatively compact proportions make the 3520.50 particularly versatile, while the automatic movement provides the convenience of self-winding mechanical performance.

At its heart is the OMEGA Calibre 1151 automatic chronograph movement, providing approximately 44 hours of power reserve. Combining chronograph performance with day, date and month functionality, the Calibre 1151 gives the Mark 40 a distinctive identity within the broader Speedmaster family and makes it an appealing alternative for collectors seeking something beyond the traditional manual-winding Speedmaster Professional.

Specifications

• Brand: OMEGA
• Model: Speedmaster Day-Date Mark 40
• Reference: 3520.50
• Year: Circa Late 1990s–2000s
• Movement: OMEGA Calibre 1151 Automatic Chronograph
• Power Reserve: Approximately 44 Hours
• Case Material: Stainless Steel
• Dial: Black
• Case Size: 39mm
• Bezel: Fixed Tachymeter Bezel
• Crystal: Scratch-Resistant Sapphire Crystal
• Bracelet: Stainless Steel Bracelet
• Wrist Size: Fits up to 18.5cm
• Water Resistance: Originally Rated to 50m (not guaranteed due to age)
• Functions: Hours, Minutes, Small Seconds, Chronograph, Day, Date, Month, 24-Hour Indicator
• Accessories: None
• Condition: A few traces of usage and some scratches can be seen, but overall the watch remains in very good condition.
• Availability: Global Concierge Sourcing Service

Key Features

• Movement — OMEGA Calibre 1151 automatic chronograph movement providing reliable Swiss mechanical performance and approximately 44 hours of power reserve.
• Triple Calendar — Day, date and month functionality provides considerably greater everyday utility than the traditional Speedmaster Professional.
• Design — Detailed black dial and tachymeter bezel retain the sporting character of the Speedmaster while giving the Mark 40 its own distinctive identity.
• Case Size — Compact 39mm stainless steel case offers excellent everyday wearability and an attractive alternative to the larger 42mm Speedmaster Professional.
• Sapphire Crystal — Scratch-resistant sapphire crystal provides excellent durability and dial clarity.
• Mark 40 Character — The combination of an automatic chronograph, triple calendar and compact proportions makes the 3520.50 one of the more distinctive and versatile Speedmaster configurations of its era.

A superb example of the OMEGA Speedmaster Day-Date Mark 40 Ref. 3520.50, combining classic Speedmaster styling with the additional practicality of automatic winding, chronograph and triple-calendar functionality. Presented in very good overall condition and available through our Global Concierge Sourcing Service, the 3520.50 offers a characterful and highly functional alternative to the traditional manual-winding Speedmaster Professional.

"Style is Timeless"