Omega Speedmaster Automatic Ref. 176.0012 "Mark 4.5" Cal. 1045 - SOLD
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It’s not a Mark IV, it’s not a Mark V. So what is the “MK4.5” Ref. 176.0012 Speedmaster? Simple. It’s a relatively uncommon model released in 1974 that uses the case of the Mark IV and the movement of the Mark V, the Omega caliber 1045, bridging the gap between the two models.
The caliber 1045 is essentially a rebranded Lemania 5100, a total workhorse of a movement developed in the 70s to combat the mounting quartz crisis. The unique layout and signature “airplane” central minutes counter have become unmistakable attributes of this durable piece of kit, used throughout the watch world in tool watches of the 70s and 80s.
Back to the Mark 4.5. It’s stainless case calls back to the first in the Speedmaster Mark series, with similar proportions and finishing to the Mark II, with a slightly taller bezel to accommodate the thicker automatic movement. This model also has a unique caseback in that it’s marked with Seamaster text, but is undoubtedly a Speedy.
The matte black dial has the familiar tritium stick hour markers, along with a day and date window in contrasting white and 5-minute interval minute markers as all in the Mark series since the III. There’s also a whopping 7 hands on the dial, which thanks to the c. 1045’s layout somehow stay incredibly legible.
We’re proud to offer this excellent example of a unique piece of Omega and Speedmaster history.
Condition is per the photos and as follows:
Case: 42mm case in very good vintage condition as shown with only minor wear. The original radial brushing and crisp polished chamfers are still present.
Bezel: Original internal tachymeter bezel in excellent condition.
Dial/Hands: Original dial and handset in outstanding condition. Hour markers have a light even patina and the hands have faded to an even eggshell color.
Caseback: Original Seamaster engraved caseback original and correct to the model with the reference number marking inside.
Crystal: Original mineral glass crystal with only very light wear.
Movement: Original Caliber 1045 automatic chronograph movement in outstanding condition and keeping excellent time with all functions working as they should including the chronograph start, stop, and reset to zero. Day and date quickset and change over as intended.
Bracelet/Strap: Original ref. 1162 bracelet in excellent condition as shown with only very minor wear. The bracelet is currently sized for a 7.25” wrist on the 4th-smallest micro extension. No extra links are available.
The caliber 1045 is essentially a rebranded Lemania 5100, a total workhorse of a movement developed in the 70s to combat the mounting quartz crisis. The unique layout and signature “airplane” central minutes counter have become unmistakable attributes of this durable piece of kit, used throughout the watch world in tool watches of the 70s and 80s.
Back to the Mark 4.5. It’s stainless case calls back to the first in the Speedmaster Mark series, with similar proportions and finishing to the Mark II, with a slightly taller bezel to accommodate the thicker automatic movement. This model also has a unique caseback in that it’s marked with Seamaster text, but is undoubtedly a Speedy.
The matte black dial has the familiar tritium stick hour markers, along with a day and date window in contrasting white and 5-minute interval minute markers as all in the Mark series since the III. There’s also a whopping 7 hands on the dial, which thanks to the c. 1045’s layout somehow stay incredibly legible.
We’re proud to offer this excellent example of a unique piece of Omega and Speedmaster history.
Condition is per the photos and as follows:
Case: 42mm case in very good vintage condition as shown with only minor wear. The original radial brushing and crisp polished chamfers are still present.
Bezel: Original internal tachymeter bezel in excellent condition.
Dial/Hands: Original dial and handset in outstanding condition. Hour markers have a light even patina and the hands have faded to an even eggshell color.
Caseback: Original Seamaster engraved caseback original and correct to the model with the reference number marking inside.
Crystal: Original mineral glass crystal with only very light wear.
Movement: Original Caliber 1045 automatic chronograph movement in outstanding condition and keeping excellent time with all functions working as they should including the chronograph start, stop, and reset to zero. Day and date quickset and change over as intended.
Bracelet/Strap: Original ref. 1162 bracelet in excellent condition as shown with only very minor wear. The bracelet is currently sized for a 7.25” wrist on the 4th-smallest micro extension. No extra links are available.
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