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Omega Speedmaster Mark 4.5 Ref. 176.0012


Vintage Omega 41.5mm Speedmaster Mark 4.5, Black Dial, Stainless Steel Bracelet, Ref. 176.0012

The Speedmaster Reference 176.0012 has been lovingly nicknamed ‘Mark 4.5’ by collectors as it combines the case of the Mark IV with the movement of the Mark V.  This watch has the (surprisingly) comfortable 42mm stainless steel case that is combined with a bracelet that tapers all the way down from 22mm to 16mm. The watch is charmingly large wearing on the wrist.

Function-focused, Omega moved the tachymeter scale from the outer bezel to inside the crystal to enhance the watch’s overall durability underneath the flat mineral glass. Then, on the dial proper, a vertically configured chronograph pairs with a day-date complication, working together to present an attractive design that’s well-equipped for the everyday. Inside, the Omega caliber 1045 powers the watch, with the automatic winding mechanism based upon a Lemania 5100 that’s been most notably modified to display a 24-hour indicator. There is a great deal of functionality in this well-made and reliable watch, making it both a good value and an interesting watch to Speedmaster aficionados.


Only 1 left in stock

Categories: , , , SKU: 210000006508

Additional information

Band Material

Stainless Steel

Band Type




Box and Papers

No Box | No Papers





Case Material

Stainless Steel

Case Size





Date, Day, Chronograph

Crystal Material

Mineral Glass

Dial Color





40mm – 42mm


1-Year Watchworks Guarantee

Item ID0006508
Model #176.0012
Model NameSpeedmaster Mark 4,5
Serial Number4XXXXXXX


Omega is one of the world’s most recognizable luxury watch brands.  Although founded in 1848, the company did not become known as Omega until 1894, when the company took the name of its highly successful new watch movement.  The revolutionary movement used a single crown for both winding and time setting.  Success followed success when in 1905, due to its commitment to accuracy, Omega became the official timekeeper for Swiss sporting events.  Later in 1932, Omega became the official timekeeper of the Olympic Games.  To mark Omega’s 100th year anniversary, Omega introduced the watch that would become one of the world’s most popular watches, the Seamaster.  While these are remarkable achievements, the watch that made Omega a legend among watchmakers was the Speedmaster, the only watch to survive the brutal NASA testing requirements and the only watch certified by NASA for use in Space.  It is no surprise that Omega watches are recognized today as spectacularly rugged tool watches hiding in a luxury watch.