The Reason

The Speedmaster is an example of an iconic design from one of the most well known of the established watch brands.

Year manufactured 2004 (Limited Edition of 2004 pieces). Stainless steel case. Dimensions: 42mm diameter; 13mm thick. Perspex glass. Luminova on hands and indexes. Caliber: Manual wound chronograph caliber 1861. Original Omega bracelet. Lug width: 20mm.

The case back is secured using a key with 6 fingers to screw onto the case centre.

Made exclusively for the Japanese market in 2004. 2004 pieces were made and delivered, but not individually numbered. They differ from the regular 3570.50 reference in that they have the special grey matte dial with red/orange accents as well as orange hands for the chrono function. This watch is inspired from a very rare grey Racing dial model delivered from 1969-1971 as well as the Speedmaster Mark II.

Diverse views of the movement from the open case back

With the case back removed you can see the black rubber seal sitting in the case which is sandwiched between the case centre and case back, rendering this union resistant.

The Speedmaster's history goes back to 1957 when it was introduced as a sports and racing chronograph, complementing Omega's position as the official timekeeper for the Olympic Games.

The "Speedmaster" name was chosen for its tachymeter scale bezel and following the Omega convention used for other models like the Seamaster - initially the Speedmaster was part of the Seamaster line - and the Railmaster.

This first Speedmaster model - reference CK 2915 also known as the "Broad Arrow"- was designed by the Swiss Claude Baillod and was already featuring some of the hallmarks of the model: the triple-register chronograph layout, the high-contrast index markers, and the domed Plexiglas crystal. The dial was an example of perfect balance and proportions. The model had straight lugs, broad arrow hands and the bezel was in steel with engraved black print. The case diameter was 39 mm.  (

The watch removed from its case

A tachymeter scale around the rim of the watchwatch can be used to compute a speed based on travel time or measure distance based on speed. The spacings between the marks on the tachymeter dial are therefore proportional to 1/t where t is the elapsed time.

Dial recto-verso

Below, the first wheel on the left is the driving wheel (or upper fourth wheel) of the chronograph, in the centre is the chronograph seconds wheel which is driven by the coupling clutch (here not shown). To the right is the intermediate wheel which is indexed every minute turning the minute recorder wheel on the far right.

The lever in the centre of the image holds down the piece underneath it which in-turn pushes against the cam system. The central lever pushes this pieces to the left to reset each time the pusher on the outside of the case is manually activated.

Diverse views of the assembled watch

The partially exploded watch

To learn more about Omega:

Watch lent for deconstruction by

Roy & Sacha Davidoff.