Omega Caliber 863 Complete Guide

The Speedmaster is unarguably the most iconic watch from Omega. Throughout the years, a number of different calibers have been used for the speedster range. One of which is the caliber 863.

The caliber 863 is a Speedmaster movement used by Omega that hasn’t gotten the same recognition as many other Speedmaster calibers, so in this post, we will highlight it and go into detail of this movement.

Omega caliber 863

The Omega caliber 863 was introduced in 1985. The movement is based on the Lemania 1873 movement. The 863 caliber is a version of the 861, but has a nicer finishing, as it is made to be used in Speedmaster watches that feature a see-through case back. This is according to the same principle today, where the 1861 is used in the Speedmaster Moonwatch with a closed case back and the caliber 1863 is used in the Speedmaster with a see-through case back. Naturally, when you have a see-through case back where you can see the movement, you want to look at a movement that is decorated in a way that makes it a sight to behold and appreciate.

The first Speedmaster to use the Omega caliber 863 was the Speedmaster reference 345.0808 which was in production between 1985 and 1990. Throughout its production period, the caliber got some changes to it. The first version, produced between 1995 and 1997 had a copper finish to it. This was then changed to a gilt color. It also got 18 jewels rather than 17, which was previously used.

The movement was eventually replaced with the new 1863 caliber.

The Omega caliber 863 is a hand-wound movement that has a power reserve of 48 hours and beats with a frequency of 21600BPH. Being a classic Speedmaster movement, it has a Chronograph, Small Seconds, Hours, and Minutes.

Omega Caliber 863 specifications

Jewels: 17 jewels, then 18 jewels from 1995
Base: Lemania 1873
Frequency: 21600BPH
Diameter: 27mm
Height: 6.87mm
Power reserve: 48 hours
Functions: Chronograph Hand, Small Seconds, Hours, Minutes

Omega caliber 863 technical sheets

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