166.077, Mark 3 (600 m / 2000 ft)

Seamaster PloProf 166.077 — 166.077, Mark 3 (600 m / 2000 ft)

1975–?

From 1975 the depth rating is printed in metres and feet, “600 m / 2000 ft”.

HODINKEE notes that over 60% of PloProfs serviced at Omega in Bienne had swapped movements, and that service dials, hands and bezels are common.

Later PloProf on a steel bracelet: the dial gives the depth rating in metres and feet, “600 m / 2000 ft”, above “Professional”. Dark blue dial with orange minute hand and date, black bezel, red release button. · Photo: Antiquorum · © Antiquorum, used with permission · Source: https://catalog.antiquorum.swiss/en/lots/omega-ref-166-077-seamaster-600-2000-ft-professional-so-called-ploprof-lot-328-11

Identifying details

Date
Date display.
Monobloc case
One-piece case without a removable caseback; the movement loads from the front.
Bezel lock
Rotating bezel that only turns while a lock button is pressed.

Variants of 166.077

Reference overview →

Switch between variants of this reference. The current variant is highlighted.
Variant	Production
166.077, Prototype	1968–c. 1970
166.077, Prototype · 166.077, COMEX Janus Prototype (Blue Dial, Red Locking Nut)	1968
166.077, Prototype · 166.077, R&D Prototype with Caliber 1001	1970
166.077, Prototype · 166.077, Titanium Prototype	Undated

Case & movement

Reference: 166.077
Production: 1975–?
Case material: Stainless steel
Case size: 45 × 54 mm
Water resistance: 600 m
Crystal: Chemically hardened mineral glass
Movement: Automatic
Date: Yes

More specifications (1)

Caliber

Movement

Omega 1002

High-beat automatic with date and hacking seconds; the only caliber Omega fitted to the Seamaster 600 PloProf, also used in the Seamaster 120 166.091.

Automatic · 28,800 vph · 20 jewels · 42 h reserve

166.077, Mark 3 (600 m / 2000 ft)

Seamaster PloProf 166.077 — 166.077, Mark 3 (600 m / 2000 ft)

1975–?

From 1975 the depth rating is printed in metres and feet, “600 m / 2000 ft”.

HODINKEE notes that over 60% of PloProfs serviced at Omega in Bienne had swapped movements, and that service dials, hands and bezels are common.

Identifying details

Date
Date display.
Monobloc case
One-piece case without a removable caseback; the movement loads from the front.
Bezel lock
Rotating bezel that only turns while a lock button is pressed.

Variants of 166.077

Reference overview →

Switch between variants of this reference. The current variant is highlighted.
Variant	Production
166.077, Prototype	1968–c. 1970
166.077, Prototype · 166.077, COMEX Janus Prototype (Blue Dial, Red Locking Nut)	1968
166.077, Prototype · 166.077, R&D Prototype with Caliber 1001	1970
166.077, Prototype · 166.077, Titanium Prototype	Undated

Case & movement

Reference: 166.077
Production: 1975–?
Case material: Stainless steel
Case size: 45 × 54 mm
Water resistance: 600 m
Crystal: Chemically hardened mineral glass
Movement: Automatic
Date: Yes

More specifications (1)

Caliber

Movement

Omega 1002

High-beat automatic with date and hacking seconds; the only caliber Omega fitted to the Seamaster 600 PloProf, also used in the Seamaster 120 166.091.

Automatic · 28,800 vph · 20 jewels · 42 h reserve

Seamaster PloProf 166.077 — 166.077, Mark 3 (600 m / 2000 ft)

Identifying details

Variants of 166.077

Case & movement

Movement

Read more

Suggest a correction

Suggest a correction

Seamaster PloProf 166.077 — 166.077, Mark 3 (600 m / 2000 ft)

Identifying details

Variants of 166.077

Case & movement

Movement

Read more

Dial, bezel & hands