Omega
Speedmaster Long S Long R Tritium - Vintage

Ref.: 3590.50 Year: 1991

In the 1990s, Space Shuttle milestones and international missions to Mir blended cooperation with rivalry, paving the way for the ISS. In that surge of human and technical adventure, the Omega Speedmaster kept quietly accompanying astronauts—and became a timeless emblem of a decade when space opened wider than ever.

Case	Steel
Diameter	42 mm
Strap	Steel Strap

Movement	Hand-wound
Caliber	Omega Caliber 861
Content	Mostra case

Diameter

42 mm
Movement

Hand-wound
Case

Steel
Strap

Steel Strap
Content

Mostra case
Gender

Man
Gender for Google

Man
Waterproofing

Not waterproof
Year

1991

Model

Moonwatch 861original
Version

Vintage
Manufacturer reference

3590.50
Certificate of authenticity

Yes
Mostra reference

MS07251083
Caliber

Omega Caliber 861
Number of rubies

17
Lug Width (mm)

20
Glass type

Plexiglas
Dial

Long S & Long R Tritium Dial
Loop

Folded Clasp Original & Signed
Strap type

Original Strap
Mini Bracelet Length (cm)

12
Maxi Bracelet Length (cm)

24
Strap color

Stainless Steel
Specificities

21600 BPH, Power Reserve 40 h,

Omega Speedmaster Vintage Tritium Ref. 3590.50 (1991)
"Time narrates the story of humanity, but only a select few carry that story on their wrists."

Imagine yourself on a summer evening, under a star-filled sky, gathered around a campfire with friends passionate about history and space exploration. The conversation moves from legendary lunar landings to modern space challenges. At that precise moment, one of your friends notices your watch subtly illuminated by the fire's glow. You smile discreetly, knowing you wear not just a watch, but a historical witness and an elegant symbol of an era where every detail mattered.

The watch you wear is the Omega Speedmaster reference 3590.50 calibre 861 from 1991, featuring a tritium dial with the distinctive "Long S & Long R" typography. Its warm, amber patina subtly conveys its historical value to those who appreciate fine horology. Every tick resonates with the spirit of a fascinating era, marked by human ambition and exploration.

Founded in 1848 by Louis Brandt, Omega quickly became synonymous with precision, innovation, and reliability. As the 20th century progressed, Omega established itself as a key player in Swiss watchmaking, chosen as the official timekeeper of the Olympic Games and for groundbreaking human achievements. The pivotal moment came when NASA selected the Speedmaster as the official astronaut watch, forever immortalized during Apollo missions, notably Apollo 11 in July 1969.

The 3590.50 model perfectly fits into this historical lineage. Produced from 1988 to the mid-1990s, it was among the last to feature original tritium dials before modern luminous materials took over. Powered by the manual-winding calibre 861, celebrated for its robustness and precision, it remains highly coveted by watch enthusiasts.

With a 42 mm stainless steel case, this Speedmaster maintains the historical lunar watch proportions. The matte black dial with aged tritium indexes and hands ensures optimal readability. The calibre 861 manual-winding movement provides approximately 48 hours of power reserve. An original steel bracelet, reference 1479 with 812 end-links, completes this elegant vintage masterpiece. Whether dressed for business, casual weekend wear, or sports activities, this versatile watch matches every occasion, subtly showcasing your taste for excellence and history.

Why choose Mostra for your vintage Speedmaster? Specializing in pre-owned luxury watches for over 40 years, Mostra offers a three-year warranty, meticulously ensuring authenticity and impeccable functionality by our expert watchmakers.