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 example features the cal 1861. The Omega calibre 1861 may very well be one of Omega’s most iconic and well-known movements. Why? Because it has been in production since 1996.
This movement is based on the Lemania 1873, which Omega previously used for the Speedmaster. It is not, however, a Master Chronometer (METAS certified). Omega’s specification for this movement is anaverage daily rate between -1 and +11 seconds per day and is complete with a 48 hour power reserve.
This example comes complete with the original box and paperwork.