Omega Seamaster 600 166.011

The Omega Seamaster 600 reference 166.011, as a specific manual-wind model, was produced in the mid-1960s, with examples noted from around 1965. This variant is significant as it represents a distinct offering within the broader Seamaster line, characterized by its manually-wound Omega Caliber 611 movement and typically a 34mm case diameter. The “Seamaster 600” designation itself often points to watches using Omega’s 6xx series manual movements. These models were positioned as versatile “half-dress, half-casual” timepieces, often featuring robust waterproof cases, some manufactured by the renowned Ervin Piquerez S.A. (EPSA). The Seamaster 600 ref. 166.011 is appreciated for its classic mid-century Omega design, reliability, and the specific appeal of a manual-wind movement, often with distinctive dial variations like black dials with crosshairs and red accents.  

Specifications

Key Details & Variations

Variations

The Seamaster 600 line, produced throughout the 1960s, came in many different dial varieties while consistently featuring a manually-wound movement. For the reference 166.011 specifically identified as a Seamaster 600, stainless steel is the noted case material. Dial variations are a key feature of the broader Seamaster 600 series, and for the ref. 166.011, a particularly sought-after version is the black matte dial, sometimes with red accents on the Omega logo and subtle crosshair features.  

Correct Dial

For the Omega Seamaster 600 ref. 166.011 (manual wind, Cal. 611):

• Markings: The dial should be signed by Omega. While not explicitly stated in all descriptions if “Seamaster 600” is always on the dial for this specific reference, it is the model’s designation. Some desirable variants feature a red Omega logo and a subtle crosshair pattern.  
• Finish: A black matte dial is a known and sought-after variant.  
• Indices: Hash marks, sometimes reminiscent of those on a Speedmaster, can be found on certain black dial versions.  
• Date Window: A date aperture is present, as the Caliber 611 includes a date function.  
• Lume: Tritium was used for the luminous plots on the dial, which would have developed patina over time.  

Correct Hands

• Style: The hands would be appropriate for a mid-century Omega Seamaster.
• Lume: The hands would have tritium lume, matching the patina of the dial’s lume plots.  

Correct Case

The case of the Omega Seamaster 600 ref. 166.011 has specific attributes:

• Shape and Dimensions: Classic 1960s Seamaster design, with a diameter of 34mm (excluding crown) and a thickness of approximately 9.5mm.  
• Material: Stainless steel.  
• Manufacturer: The Seamaster 600 line was noted for its waterproof cases, often manufactured by EPSA (Ervin Piquerez S.A.).  
• Case Back: Screw-in design, featuring the Seamaster Hippocampus logo. The inside of the case back should bear Omega markings, the reference number (166.011), and material indication.  
• Finishing: Expected to have finishes typical of Omega cases from the 1960s, with a mix of polished and brushed surfaces. Crisp case lines are desirable.  
• Crown: Omega-signed crown.  
• Lug Width: 18mm.  
• Original Water Resistance: These were designed as “waterproof” cases. Similar manual-wind Seamaster 600 models like the ST 136.0011 had an official water resistance of 30 meters (3 bar / 100 feet). This rating is not guaranteed on vintage pieces today.  

Additional Details

The Omega Seamaster 600 ref. 166.011 is powered by the Omega Caliber 611.  

• Type: Manual-winding.  
• Jewels: Typically 17 jewels for the 6xx series with date.  
• Frequency: 19,800 vph.  
• Power Reserve: Approximately 48-50 hours.  
• Functions: Hours, minutes, sweep seconds, and a date complication.  
• Features: Part of Omega’s reliable 600-series of manual movements, known for their slim profile and accuracy. Features an excenter regulator.  

The watch was originally fitted with a Plexiglass (acrylic) crystal. Original Omega crystals might have a tiny Omega logo etched in the center.  

The Seamaster 600 ref. 166.011 was likely originally offered on a leather strap. The lug width is 18mm, allowing for various aftermarket strap options.  

The Omega Seamaster 600 ref. 166.011 is considered a desirable vintage piece, offering classic Omega styling and a reliable manual-wind movement from a respected era. Examples with sought-after black matte dials, especially those with red accents or crosshair features, can command higher interest. A 1965 example with a black dial was listed by Hodinkee for $1,500. Condition, originality (especially of the dial and case), and movement health are key value drivers.  

• Serial Number: Check the movement serial number (e.g., a 1965 model might have a serial like 22,386,825).  
• Logos and Fonts: Omega logos on dial and crown, and text on the dial should be crisp and period-correct.  
• Movement Markings: Caliber 611 should be signed “Omega Watch Co. Swiss,” with jewel count and serial number.  
• Consistency: Ensure the manual Caliber 611 is housed in a 34mm case, and dial markings (if “Seamaster 600” is present) are appropriate.
• Dial Originality: Look for signs of repainting; original patina is preferred.
• Case Back: Seamaster Hippocampus logo on the exterior; correct Omega markings and reference 166.011 inside.