Omega Speedmaster Calibre 321 Professional Chronograph 42 mm

311.90.42.30.99.002

Omega Speedmaster Calibre 321 Professional Chronograph 42 mm reference 311.90.42.30.99.002 is a chronograph watch with a 42mm platinum case, 13.4mm thick, 47.6mm lug to lug, driven by the Omega 321, with a 55h power reserve, water resistant to 50m, in production as of November 2026.

Diameter

42mm · manufacturer

Thickness

13.4mm · manufacturer

Size

Midsize

Lug to lug

47.6mm · manufacturer

Water resistance

50m · manufacturer

Movement

Omega 321 · manufacturer

Type

Chronograph · manufacturer

Case material

Platinum · manufacturer

Case shape

Round · manufacturer

Dial

Black · manufacturer

Dial finish

Stone, Other · manufacturer

Complications

Chronograph · manufacturer

Crystal

Scratch-resistant sapphire crystal with anti-reflective treatment on both sides; sapphire caseback · manufacturer

Power reserve

55h · manufacturer

Straps

Integrated Bracelet · manufacturer

Origin

Swiss (Heritage)

Era

Reissue / Heritage · manufacturer

Manufacturer: from the brand’s own product page. Corroborated: the same figure found on two or more independent pages. Entered by Horowell: chosen by a person at Horowell. Unverified: from another source, not yet checked.