Omega Genève Automatic Ref. 166.042 – A Distinctive Omega from the Late 1960s
The Omega Genève Ref. 166.042 is one of the most distinctive examples of the brand's experimentation with geometric case shapes in the late 1960s. With its angular case measuring approximately 33 mm in width, broad brushed surfaces, pronounced facets, and proportions that give it a more commanding presence on the wrist than its size suggests, it immediately stands apart from the classic round Omega designs of the era.
**IMPORTANT NOTE: As this item ships from within the European Union, you will not be liable for customs duties within the EU.**
However, it is not merely its shape that makes the 166.042 truly interesting. While the dial bears the "Genève" signature, the stainless steel caseback features Omega’s Seamaster Hippocampus emblem. This is due to the reference's unusual case architecture: the 166.042 utilizes a special case construction—defined in collector literature as the "Compressor" type—that operates differently from traditional screw-down or snap-on casebacks. Consequently, opening the watch requires methods and equipment distinct from those used for standard Omega cases.
The silver-colored sunburst dial features a fine surface texture that shifts in tone depending on the light. Gold-tone applied baton indices, hands with black inserts, and a framed date window at the 3 o'clock position create a balanced aesthetic that complements the gold-colored case. A particularly noteworthy aspect in the photos is the condition of the case: the broad brushed surfaces, sharp corners, and geometric transitions remain remarkably well-preserved.
The Ref. 166.042 is powered by Omega’s 24-jewel Calibre 565 automatic movement. Operating at a frequency of 19,800 vph, the Cal. 565 is a date-equipped member of Omega’s 55x movement family and features a quick-set date mechanism operated via the crown. This example retains its original Omega-signed crown.
The “Plaqué G 20” stamp on the Omega-signed buckle indicates that it is gold-plated to a thickness of 20 microns. The watch is also accompanied by the period-correct burgundy-red Omega box shown in the photos.
Final Thoughts
"Genève" on the dial, the Seamaster Hippocampus on the case back, and Omega’s exceptional case engineering bridging the two—the collectible appeal of the Ref. 166.042 lies precisely in this unexpected combination.
The item shown here was manufactured in 1969.
PROFESSIONALLY FULLY SERVICED.
The movement has been completely disassembled; every part has been cleaned, lubricated, and precision-adjusted to ensure flawless operation. (It requires no further service for three years, provided it is not subjected to adverse conditions.)
Product Condition: Tested; all functions are fully operational.
