Omega Calibre 2500, introduced in 1999, was the first production Omega movement to use the brand’s co-axial escapement.
The co-axial escapement was invented by British watchmaker George Daniels, who sought to reduce sliding friction between components. Omega industrialized the design for serial production and introduced it in modified automatic movements based on the ETA 2892-A2. Calibre 2500 became the first widely produced Omega movement incorporating the technology.
The escapement was intended to improve long-term stability and reduce the need for lubrication at certain contact points. Later Omega movements, including the in-house 8500 family, developed the system further and added other technical features.
Calibre 2500 is sometimes confused with Calibre 8500 because both are associated with Omega’s modern co-axial era. The 2500 came first and was based on an existing movement architecture, while the 8500 was designed as a newer in-house platform.