Omega Caliber 1861 Complete Guide

Omega caliber 1861

Omega Caliber 1861 Complete Guide

The Omega caliber 1861 may very well be one of Omega’s most iconic and well-known movements. Why? Because it has been in production since 1996, and if that is not a sign of performance and that Omega with the movement’s durability, we don’t know what is.

The Caliber 1861 is a chronograph movement, and is used in Omega’s most legendary model range – the Speedmaster. Throughout the years, it has been used in countless of Speedmaster models. Most importantly the Speedmaster Moonwatch professional hesalite reference 311., which is a descendant of the original legendary 42mm Moonwatch which was worn on the moon, and contributed to the immense success of the Speedmaster.

Let’s look at the caliber 1861 in detail.

Omega caliber 1861

The Omega caliber 1861 is a hand-wound chronograph movement from Omega which, in writing moment has had a production run of 26 years. Apart from the fact that it is used in Omega’s most iconic watch, its long production run proves it is singularly precise and reliable. This movement operates with a frequency of 21,600 beats per hour (3Hz). It offers a power reserve of 48 hours and is equipped with 18 jewels.

Photo by

This movement is based on the Lemania 1873, which Omega previously used for the Speedmaster. It is not, however, a Master Chronometer (METAS certified), and since Omega has given this certification to more and more movements in its range in recent times, we can expect the 1861 to follow. With that said, we are quite confident that this caliber will eventually replaced by a new, METAS certified Moonwatch caliber. Regarding that, we will just have to wait and see.

The predecessor to the 1861 is the caliber 861. The difference between the 861 and the 1861 is that the 861 becomes the 1861 when the calibre is rhodium plated in 1996.

The caliber 1861 has a diameter of 27.00mm and a height of 6.87mm. Being a chronograph movement, it features a Chronograph hand, small seconds, Hours, Minutes. In turn, Omega has developed three new calibers that are based on the 1861. These include the caliber 1863, 1866, and 866.

Omega caliber 1861 accuracy

Omega’s specification for this movement is an average daily rate between -1 and +11 seconds per day. This is with the chronograph function not active.

Omega caliber 1861 VS Caliber 1863

The Omega caliber 1861 and 1863 are two very similar movements. The 1863 is based on the 1861 and they have the exact same specifications. The difference lies in the fact that the 1863 is used for see-through case back Speedmasters, whereas the 1861 is used in watches with a solid case back. As such, the difference lies in the decoration. The 1863 is more decorated and features circular graining on the baseplate, bridges with Geneva stripes (Côtes de Genève), as well as polished edges on levers and bridges. Furthermore, the Caliber 1863 has a metal chronograph brake and the Caliber 1861 has a Delrin chronograph brake made in a plastic polymer material.

Omega caliber 1863

Omega caliber 1863.

The easy way to describe the difference is that the 1863 is the more luxurious version of the 1861 as it is made to be seen, whereas the 1861 is not.

Source:Flickr: Omega Cal. 1861 Chronograph Movement

Omega caliber 1861
Omega Speedmaster Professional

Omega Caliber 1861 specifications

  • Jewels: 18
  • Frequency: 21,600 beats per hour (3Hz)
  • Functions: Chronograph, small seconds, Hours, Minutes.
  • Diameter: 27mm
  • Height: 6.87 mm
  • Introduced: 1996
  • Technology: Delrin chronograph brake made in a plastic polymer material.
Leave a Reply

Your email address will not be published. Required fields are marked *