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The Encyclopedia of Horology

Wristwatch · Diver's watch

Omega Seamaster Professional 600 'Ploprof'

Partially verified

The Omega Seamaster Professional 600, known as the 'Ploprof' (Plongeur Professionnel), is a stainless steel dive watch developed for deep-sea exploration and commercial diving projects, including those for COMEX. Introduced as a prototype at the 1969 Basel Fair and released for public sale in April 1971, the model features a large 55mm asymmetrical steel case designed for high-pressure environments. The watch is equipped with a bidirectional rotating bezel, secured by a distinctive red locking push-button at the top of the case, and a protected crown system. It features a matte blue 'Mk V' dial with tritium-based luminous markers and a date display. The movement is an automatic caliber with a date complication. The auction description notes the case retains its factory geometry and the watch has been serviced.

Omega Seamaster Professional 600 'Ploprof' ref. 166.077 featuring the red bezel-lock button and matte blue dial.
Omega Seamaster Professional 600 'Ploprof' ref. 166.077 featuring the red bezel-lock button and matte blue dial. — Zamanito / Craft & Tailored. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
zamanito.com
Category
Wristwatch · Diver's watch
Maker / attribution
Omega
Reference
166.077
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
1970s
Source-reported place
Switzerland

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Dial Design

The Seamaster Professional 600 is characterized by its significant 55mm asymmetrical stainless steel case. This construction was specifically engineered for demanding underwater pressure environments associated with late 1960s offshore oil rig development and deep-sea exploration. The case design incorporates a specialized crown protection system to ensure water resistance and operational security.

The timepiece features a matte blue dial, identified in the source as the 'Mk V' variant. It displays tritium luminous hour markers, which exhibit a soft green tone. The original metallic date wheel remains in place within the aperture at the three o'clock position. The crystal is composed of mineral glass.

Evidence for this section
  • “بدنه ساعت از جنس استیل ضدزنگ ساخته شده و ساختار قفل تاج محافظ و مهره آن به درستی کار می‌کند”
  • “صفحه ساعت با رنگ آبی مات و نامگذاری Mk V شناخته می‌شود و دارای نشانگرهای تریتیوم با رنگ سبز ملایم است”
  • “کریستال آن از جنس شیشه معدنی (مینرال) است.”

Bezel and Functionality

The watch utilizes a bidirectional rotating bezel designed for professional diving applications, referred to as the 'Mk II' bezel. To prevent accidental adjustment while submerged, the mechanism is held in place by a prominent red push-button locking mechanism located at the top of the case.

The watch is mounted on an Omega 1162 stainless steel bracelet equipped with 162 end links. The auction description reports that the case maintains its original factory lines and geometric profile, notwithstanding natural signs of wear from previous use.

Evidence for this section
  • “دکمه فشاری قرمز رنگ جهت قفل نگه‌داشتن بزل چرخشی در بالای قاب تعبیه شده است”
  • “بزل ساعت از نوع Mk II بوده”
  • “بند استیل نصب‌شده روی ساعت مدل Omega 1162 با قطعات انتهایی 162 است که دارای ۲۳ قطعه بوده و برای مچ دست تا ۸ اینچ اندازه دارد.”

History and Servicing

Omega developed the Seamaster 600 in response to the specific requirements of professional diving entities such as COMEX. It was first presented as a prototype at the 1969 Basel Fair before becoming commercially available in April 1971. The object is sold without original packaging or accompanying historical documentation.

According to the auction description, the watch has recently undergone a full service to ensure accurate timekeeping.

Evidence for this section
  • “امگا مدل Seamaster 600 را برای پاسخ به این نیازها و پروژه‌های شرکت‌هایی مانند کامکس (COMEX) طراحی کرد.”
  • “این مدل نخستین بار در نمایشگاه بازل ۱۹۶۹ به عنوان پیش‌نمونه معرفی شد و سپس در آوریل ۱۹۷۱ جهت فروش عمومی عرضه گردید.”
  • “ساعت به تازگی سرویس کامل شده و دارای کارکرد زمانی دقیق همراه با یک سال ضمانت فروشنده است”

Open research questions

  • What is the specific production date range for this individual reference 166.077 case?
  • Are there visible service markings on the interior of the caseback indicating past maintenance history?

Source evidence

Recorded claims and source quotations for Omega Seamaster Professional 600 'Ploprof'
FieldSource-reported valueSource quotation
MakerOmega“امگا (Omega)”
Reference166.077“رفرنس 166.077”
Case Diameter55mm“۵۵ میلی‌متر”
BezelMk II“بزل ساعت از نوع Mk II بوده”
DialMatte blue Mk V“صفحه ساعت با رنگ آبی مات و نامگذاری Mk V شناخته می‌شود”
BraceletOmega 1162 with 162 end links“بند استیل نصب‌شده روی ساعت مدل Omega 1162 با قطعات انتهایی 162”
Date of IntroductionApril 1971“سپس در آوریل ۱۹۷۱ جهت فروش عمومی عرضه گردید.”

Visible details

  • Asymmetrical stainless steel case measuring 55mm
  • Red push-button on the case top for bezel locking
  • Matte blue dial with tritium markers
  • Omega 1162 steel bracelet with 162 end links

Research qualifications

  • The exact state of the internal movement components is not detailed
  • The degree of tritium aging and dial consistency is based on source reports

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

ساعت مچی غواصی امگا Omega Seamaster Professional 600 Ploprof رفرنس 166.077

Reviewed 2026-11-02 · Record f77a94022a

Terms in this record

Glossary explanations for terms named in this object’s record.

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