Omega Seamaster 120, Ref. 135.027, Cal. 601, Men’s Diving Vintage Watch, 1970

Vintage Omega Seamaster 120 Diving Vintage Watch from 1970 with men’s manual wind Caliber 601, black dial, tritium lume and original 1069/524 bracelet—refined tool-watch character, now for sale.

Omega Seamaster 120 1970 — First impression - 135.027

The Seamaster 120 Ref. 135.027 captures the pure “skin-diver” aesthetic Omega perfected at the turn of the 1970s. The compact 36 mm stainless-steel case, a rotating minute bezel, and a high-legibility black dial deliver purposeful clarity without bulk. Its proportions hug the wrist, while the domed plexiglass crystal lends period warmth and distortion at the edges. The overall impression is of a capable dive timepiece with understated elegance—robust enough for aquatic duty yet refined for everyday wear. Inside, Omega’s manual wind Caliber 601 provides dependable, precise timekeeping and the tactile pleasure of a daily wind, a combination collectors value in vintage Swiss watchmaking.

Omega Seamaster 120 - Tritium Markers Black Dial

The dial is matte black with a full minute track and elongated tritium plots that glow to a warm patina. Applied batons at the quarters add depth, while the “Seamaster 120” script above six confirms the model lineage. A luminous pip at the 12 o’clock bezel index aligns perfectly with the dial, enhancing timing legibility in low light.

Seamaster 120 135.027 - Luminous Baton Hands

Slim baton hour and minute hands carry tritium infill for clear underwater reading. The central seconds hand is painted white with a luminous tip, sweeping crisply over the deep chapter ring. The handset balances minimal mass with maximum visibility—hallmarks of Omega’s functional design language of the era.

Omega Seamaster 120 135.027 - Rotating Bezel Stainless-Steel Case

The steel skin-diver case combines brushed upper surfaces with polished flanks for contrast. A black aluminum count-up bezel provides 60-minute timing with engraved numerals at 10/20/30/40/50 and precise hash marks between. The screw-back is engraved “Ω Seamaster 120 Waterproof” with the hippocampus—an icon of the brand’s maritime heritage. The domed plexiglass crystal adds vintage charm and is appropriately resilient to knocks.

Seamaster 120 135.027 - Crown

An Ω-signed, push-pull crown sits at three o’clock with ample grip for daily winding and on-the-fly time setting. Its low profile keeps the watch sleek and comfortable while maintaining the reference’s clean silhouette.

Omega Seamaster 120 Stainless-Steel Bracelet

This example is paired with the correct Omega stainless-steel bracelet Ref. 1069, fitted with **524** end-links and an Ω-signed clasp. The multi-link architecture drapes smoothly for comfort and preserves the watch’s authentic period presence.

Caliber 601 Manual Wind — Swiss-Made Performance

Powering the watch is Omega’s in-house Caliber 601, a hand-wound movement from the revered 30 mm family. Operating at approximately 19,800 vph (≈2.75 Hz), it is celebrated for straightforward engineering, excellent parts availability, and stable accuracy when properly serviced. The movement pictured is clean and correct for the reference, with copper-colored bridges, fine finishing, and the characteristic architecture that made this series a benchmark of precision timekeeping. For collectors, the 601 provides reliability on the wrist and long-term serviceability.

Heritage of the Omega Seamaster 120 in the Skin-Diver Era

Introduced as a lighter companion to Omega’s professional dive watches, the Seamaster 120 distilled essential underwater timing functions into a svelte, wearable package. Late-1960s and early-1970s examples like this one exemplify the brand’s blend of utility and elegance—rotating bezel, strong water resistance, and a slim profile suitable for daily wear. The reference 135.027 sits at the crossroads of mid-century design and the emerging sport-watch culture, making it a prized historic wristwatch for enthusiasts of vintage Swiss watchmaking.

Wearing Experience & Dimensions — Skin-Diver Proportions

At 36.0 mm across with slender straight lugs and a 19 mm lug width, the watch offers balanced ergonomics and an easy fit under a cuff. The compact case and domed crystal provide presence without excess height, while the 1069 bracelet’s articulation ensures comfort during extended wear. On the wrist, it feels purposeful, versatile, and unmistakably classic.

Omega Seamaster 120 — Condition, Originality, Warranty & Shipping Worldwide

This Seamaster 120 presents in excellent vintage condition with a sharp case, correct period bezel and tritium lume that has aged evenly. The Ω-signed crown, Omega 1069 bracelet with 524 end-links, and Cal. 601 movement are all original to the watch. It has been fully serviced and is running properly. We include a 12-month warranty and secure worldwide shipping from our workshop—buy with confidence.

Browse more from the brand in our Omega vintage divers collection featuring references like 135.027, or discover our curated selection of 1960s–1970s diving vintage watches.