Omega Seamaster 120 m Ref. 2511.21.00 – A Complete Time Capsule from 1991
It is not always just age or rarity that makes a vintage watch valuable; sometimes, the real distinction lies in how much of its past it has preserved into the present. This 1991 Omega Seamaster 120 m is a perfect example of this, boasting exceptional completeness—from the watch itself to its original boxes, warranty card, instruction manual, metal ID tag, and even the original ¥140,000 price tag from Japan.
**IMPORTANT NOTE: As this item ships from within the European Union, you will not be liable for customs duties within the EU.**
The Ref. 2511.21.00 hails from the early 1990s, a period when the Seamaster line merged its signature professional diving character with a more restrained, urban design. While the stainless steel case, wide and clean bezel, protected screw-down crown, and 120-meter water resistance clearly signal its sporty roots, the white dial and slender proportions transform it into a classic everyday Omega.
The dial design captures the spirit of the era. The outer ring—featuring combined hour and minute scales—along with the baton indices at 12, 3, 6, and 9 o'clock and the round markers between them, upholds the Seamaster’s focus on legibility. Meanwhile, the luminous details have aged into a warm cream tone, lending the watch a natural vintage character that cannot be artificially replicated today. A date window at the 3 o'clock position and the "Seamaster 120 m" signature in a script typeface complete the design.
Inside, the watch is powered by the Omega Calibre 1438 quartz movement, which was used in the early examples of this reference. This detail is not based on guesswork: the original Omega metal tag preserved with the set displays the reference number 25112000, the serial number 54,435,298, and the caliber code 1438 all together. The fact that later production runs of this same reference (2511.21.00) switched to the Calibre 1538 makes this particular watch especially interesting as an early configuration of the model.
The serial number also confirms the watch's era. The serial number 54,435,298—falling within the 54-million range—corresponds to production in 1991. Thus, we have more than just a rough estimate of the time period; we have a robust identity where the reference, serial, and caliber information—derived from the watch's own period-correct tag—mutually reinforce one another.
The multi-link original Omega steel bracelet is also a key element of the watch's character. While the bracelet's curved end links embody the Omega design language of the 1990s, the gold-colored Omega emblem on the clasp serves as a small yet instantly recognizable detail of the era.
However, what truly completes the story of this example are its accessories. The original Omega inner and outer boxes, International Warranty card, leather document wallet, instruction manual, metal ID tag, and the Japanese price tag marked ¥140,000 all remain with the watch today. Considering that even the boxes of most watches go missing over the course of three decades, the fact that all these items have stayed together is remarkable in itself.
Consequently, the watch before us is not merely a well-preserved Seamaster 120. It is an Omega that can still recount—through its own original documentation—how it was specified in 1991, the movement with which it was produced, and the price at which it was sold in Japan.
Final Word
Thirty-five years later, the watch itself still keeps time. Its box, tag and documents show its time.
The item shown here was manufactured in 1991.
PROFESSIONALLY FULLY SERVICED. The watch movement has been completely disassembled, and every part has been cleaned, lubricated, and precisely adjusted to ensure smooth operation. (It requires no maintenance for three years, provided it is not exposed to adverse conditions.)
Product Condition: Tested; all functions are fully operational.
