36+ Omega Calibre 1861 Review US. That is not really fair of course, as the original speedmaster professional 145.022 had a slightly different dial for a couple of years as well as some other minor differences. Just wondering what everybody elses experience is with their speedies and 1861 movts.
The calibre omega 1861, below the balance wheel.
As such, the caliber 3861 is technically, at its core, an 1861 movement, but with a number of changes made to it. It was based on the lemania calibre 1873, which has been used in a couple of tag heuers and a slew of speedmasters. 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. Omega caliber 321, 861, 1861, 3861, others: