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.
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.
"...the water-resistant Seamaster collection, introduced in 1948, did become a commercial success...A seahorse emblem has graced the casebacks of this line since 1958 as a symbol for water resistance...The logo was conceived by engraver Jean-Pierre Borle, who was inspired in Venice by an image of Neptune, the Roman god of the sea, driving a chariot pulled by seahorses (this is why Omega seahorses wear bridles)." "Diving with the Seahorse" by Jens Koch
Diverse views of the movement from the open case back
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. (http://www.timeandwatches.com/p/history-of-omega-speedmaster.html)
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.
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.
Diverse views of the assembled watch
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Watch lent for deconstruction by