the making of the limited edition longitude

machining the meridian line

A special ring of meridian line was provided to Bremont by The Royal Observatory Greenwich which has been skillfully machined from raw material using Bremont's in-house CNC machining expertise. Once manufactured, this special insert is set behind the sapphire crystal with Longitude coordinates for the Royal Observatory in Greenwich.

play video


The 22 jewelled ENG376 movement boasts an enviable technical specification. With a depth of 4.95mm and diameter of 25.6mm, the ENG376 features a 65-hour power reserve, a silicon escapement, a custom balance bridge designed to reflect the architecture of Bremont’s state-of-the-art headquarters at The Wing, the home of British watchmaking, and the automatic movement is powered by a full tungsten rotor.


A significant component in this process is the free sprung balance wheel. This is the beating heart of the ENG376. 4 x Ø0.4mm screws are used to adjust the regulation, whilst the combination of the shock protection and a full balance bridge protect against vibration and shock loads.

Movements are carefully inspected prior to assembly of the Automatic Module. A stereo microscope gives a superior depth-of-field whilst a high definition camera projects the image to a screen to aid with training and data logging.


The Automatic Bridge is assembled with the one piece tungsten balance weight before completing the movement assembly. The 3 screws securing the bridge use a threadlocking compound to prevent them working loose as the oscillating weight spins.