OMEGA Speedmaster Professional Moonphase Chronograph 42mm

This 42mm automatic Chronograph timepiece from the OMEGA Speedmaster Professional family incorporates a three-counter chronograph endowed with a poetic moonphase display.

The OMEGA Speedmaster Professional Moonphase Chronograph model displays a small-seconds sub-dial at 9 o’ clock. It has two chronograph counters: 30-minute recorder at 3 o’ clock and 12-hour recorder at 6 o’ clock. It comes with three centre hands for indicating hour, minute and chronograph 60 seconds. A fourth sub-dial, at the 12’clock position, has moonphase and date indicators.

This watch is available in stainless steel, 18-carat white gold and platinum versions. Beating inside is a meticulously finished manual-winding movement with 48 hours power reserve. Omega has equipped both steel and white gold versions of the Speedmaster Professional Moonphase Chronograph with the caliber 1866, which is based on the famous caliber 1861 with additional moonphase and date indicator.

The mechanical calibre is visible through the transparent caseback. The 42mm diameter case is mounted with a black tachymeter bezel for steel and white gold models.

The Speedmaster Professional Moonphase Chronograph timepiece comes with a two-position crown at 3 o’ clock for winding and time-setting. It should be noted that the calibre does not have a ’stop second’ mechanism. Further, it has two push-buttons (at 2H and 4H) for chronograph functions. It employs two correctors on the left side of the case: one for setting the date (small counter at 12 o’clock) and one for correcting the moon phase.

All the Speedmaster Professional Moonphase Chronograph models mentioned here feature baton hands for hour and minutes, and a spear-shaped centre seconds hand.

The Omega Speedmaster Professional Moonphase watch with 18K white gold case, silver dial and black leather strap (reference 3689.30.31) was introduced in 1999 to mark the 30th anniversary of the landing of Apollo 11, the spaceflight that first landed humans on the Moon.

Created in collaboration with Armin Strom, the Platinum model (reference 3688.30.32) features a skeleton dial and platinum tachymeter bezel. It houses the Calibre 3604 (skeletonised version of cal.1866). This open-worked movement highlights the exceptional open-working, engraving and hand-finishing works of independent Swiss watchmaker Armin Strom.

Limited to 57 pieces, this special Speedmaster Professional Moonphase watch in platinum was released in 2003. It boasts a beautifully crafted skeleton dial (with silvered finish on yellow gold base) with blued gold hour markers and blued steel hands. The limited edition number (X/57) is displayed in red color just above the moon phase date sub-dial at 12 o’ clock.

Technical details

Model: Omega Speedmaster Professional Moonphase Chronograph 42mm

Movement
Caliber Omega 1866 for steel and gold models
Caliber Omega 3604 for platinum model
Manual−winding chronograph movement with rhodium−plated finish
Frequency: 21,600 vph (3Hz)
Power Reserve: 48 hours

Case
Stainless steel case/ 18ct. white gold case/Platinum
Diameter: 42mm
Lug width: 20mm
Scratch−resistant sapphire crystal with anti−reflective treatment inside
Water resistance: 30 meters/100 feet

Functions
Chronograph
Small seconds
Moonphase
Tachymeter

References
3689.30.31: 18ct. white gold case, black leather strap, silver dial
3688.30.32: Platinum case, brown alligator leather strap, open-worked dial
3876.50.31: Stainless steel case, black leather strap, black dial
3576.50.00: Stainless steel case and bracelet, black dial