Oriosa, Ref. 2789W, Cal. ETA 2789, Men’s Automatic

Oriosa 2789W — blue sunburst depth in a broad 1970s case

The 36 mm case and 40 mm lug-to-lug measurement give this Oriosa compact vintage dimensions, yet the broad cushion-shaped body creates more visual presence than a conventional round dress watch of similar diameter. Its brushed upper surface, polished bezel and bracelet transition establish a distinctly 1970s profile. The blue dial shifts from slate to near-black as the light changes.

Blue sunburst dial with applied luminous-style batons

The dial uses a radial sunburst finish with applied rectangular hour markers around a fine white minute track. Each marker carries a pale central insert, and the broad hour and minute hands use matching inserts. ORIOSA SWISS is printed below 12 o’clock, while AUTOMATIC, 25 JEWELS and INCABLOC appear in the lower half. T SWISS MADE T is visible at the outer edge.

Framed day-date aperture as the main complication

A large framed day-date display occupies 3 o’clock, giving the watch a practical period identity. Weekday and numerical date sit side by side inside a raised silver-tone frame and remain easy to read against the darker dial. A slender central seconds hand completes the display without competing with the broad hands or applied markers.

Stainless steel case with brushed planes and polished accents

The confirmed stainless steel case combines a broad brushed top with polished facets and a smooth circular bezel. This contrast emphasizes the geometry while keeping the dial opening clearly defined. Light age-related marks and normal surface wear are visible, but the brushed character remains clear. The short 40 mm overall length helps the broad case sit compactly on the wrist.

Ridged crown and clean case-side proportions

A ridged crown at 3 o’clock provides practical grip for time and calendar adjustment. Its modest size preserves the balanced side profile. No crown signature is clearly visible in the supplied photographs, so no signed-crown claim is made.

Original multi-link stainless steel bracelet

The stainless steel multi-link bracelet visually suits the period case architecture. Alternating broad and narrow links create a flexible articulated profile and continue the silver-tone palette. Because the watch is confirmed as All Original, the bracelet is presented as part of the original watch components. Its exact fitted wrist circumference is not supplied.

ETA 2789 automatic movement with 25-jewel specification

The confirmed ETA 2789 caliber provides automatic winding and powers the day-date display. The dial states 25 JEWELS and INCABLOC, allowing both details to be presented as confirmed features. The supplied data also identifies a frequency of 21,600 vibrations per hour. The watch is listed as serviced and fully operational, supporting practical ownership of this vintage Swiss automatic.

1976 Swiss styling with a practical day-date focus

Dated to 1976, this Oriosa reflects the era’s preference for broad shaped cases, applied markers and useful calendar complications. The dark sunburst dial and framed day-date give it a sportier visual character than a conventional dress watch, while the 36 mm dimensions preserve classic proportions. Compare related pieces through our Oriosa vintage watches with 1970s Swiss mechanical character or browse automatic vintage watches with day-date functionality and period case design.

Serviced originality and present-day condition

This Oriosa is confirmed as serviced, fully operational and fitted with all original watch components. The blue dial remains highly legible, with light aging visible on the hands and markers, while the stainless steel case and bracelet show normal signs of use. No box or papers are included. A 12-month warranty accompanies the watch.