Sicura Cogemeast Diver 600ft, Cal. Ronda-Matic 1238, Men’s Diving Vintage Watch, 1970

Vintage Sicura Cogemeast Diver 600ft Diving Watch from 1970 with the Swiss automatic Ronda-Matic 1238 for men; a rare Pepsi bezel, vertical day-date layout and domed acrylic crystal make this refined tool watch stand out, and it is for sale.

Sicura Cogemeast 1970 — First impression - Diver 600ft

This Cogemeast badged Sicura is a charismatic 1970s skin-diver: a matte black dial framed by a period-correct red/blue “Pepsi” minute bezel and a crisp stainless steel screw back. The vertical day–date aperture at 3 o’clock, oversized lume plots and lollipop seconds bring immediate legibility that divers prized. At 38 mm, it wears modern without losing its vintage Swiss watchmaking charm. The case shows honest light wear, exactly what collectors expect of an original example, while the acrylic crystal keeps the silhouette faithful to the era and enhances the depth of the dial.

Cogemeast — matte black, vertical day-date Dial

The dial is original and cleanly printed: “COGEMEAST 17 JEWELS / AUTOMATIC” balances the graphics, with radium-free, period lume aging to a pleasing cream tone. Large circular plots and rectangular batons at 6/9/12 are calibrated for fast reading, an aesthetic rooted in professional timing instruments.

The day and date display stack vertically within a chamfered window, a rare layout among 1970s divers that gives this timepiece a distinct identity and collectible edge.

Cogemeast Diver 600ft — lollipop seconds Hands

The handset pairs a broad, arrow-style hour with a needle minute; both are filled with matching lume for balanced night visibility.

A central sweeping seconds with a luminous “lollipop” marker completes the tool-watch language, tracking elapsed time against the bezel with intuitive precision.

Sicura Cogemeast Diver 600ft — Toolish skin-diver geometry Chrome-Plated Case

The period chrome-plated case (with stainless screw back) delivers the classic skin-diver profile: slim mid-case, straight drilled lugs and a grippy coin-edge bezel. The bi-color timing ring adds functional contrast for decompression timing while preserving the watch’s historic wristwatch proportions. At 38 mm it bridges vintage authenticity and contemporary wearability; the domed acrylic crystal softens reflections and contributes to the warm, heritage look collectors love. Case back engravings confirm Swiss origin and water-resistance ratings used by Sicura across its Submarine-family designs of the era.

Cogemeast Diver 600ft — Crown

The unsigned, deeply fluted crown sits at 3 o’clock for easy operation, with firm setting and a positive winding feel. It is period-correct for Sicura divers and, unlike later screw-down systems, keeps the profile elegant while remaining practical for everyday rotation.

Sicura Cogemeast — NATO textile Strap

The watch is paired with a black NATO textile strap that reinforces the utilitarian character and fits a range of wrists. The steel hardware mirrors the case back and keeps the package light, secure and ready for casual wear.

Sicura Cogemeast — Ronda-Matic 1238 Swiss automatic movement

Inside beats the Ronda-Matic 1238, a Swiss automatic calibre widely used by Sicura in the late 1960s and early 1970s. The movement is distinguished by its gold-anodized bridges (this example signed “SICURA SA”), jeweled lever escapement and a practical day-date mechanism. Operating at approximately 18,000 vibrations per hour with typically 17 jewels, it delivers the steady, low-wear cadence collectors associate with reliable vintage mechanical watch design.

Historically, the 1238 underpinned many independent Swiss brands, offering accessible automatic performance with robust parts support. For today’s enthusiast, that translates into dependable timekeeping, serviceability, and the satisfying rotor-driven character only a mechanical watch can provide.

Heritage of the Sicura Cogemeast in 1970s Diver Design

Sicura’s 1970s divers captured the adventurous spirit of the era—bold color, high-contrast dials and functional bezels—while keeping prices within reach. The Cogemeast signature appears on a small run of export dials, making this configuration notably scarce. The case back architecture mirrors Sicura’s Submarine line, connecting this piece to the brand’s broader exploration of rugged, water-resistant tool watches. For collectors of vintage Swiss watchmaking, this model embodies the crossroads of utility and exuberant 70s styling, a slice of horological history that remains authentic on the wrist.

Sicura Cogemeast — 12-month warranty, shipping worldwide: Condition, Originality & Confidence

Fresh from a full service, this watch is fully operational with all original watch components retained. Lume, dial print and handset present uniformly and the bezel insert shows even, honest aging consistent with a well-kept historic wristwatch. We provide a 12-month warranty and ship worldwide with secure, tracked delivery. See our Diving Vintage Watch selection with day-date dials.