As any certified omega watchmaker will tell you, an Omega Speedmaster cal. 1861 mechanism is a delicate and intricate timepiece. The process of overhauling one of these watches is both painstaking and time-consuming, but the results are well worth it. The first step is to disassemble the watch, cleaning each part individually in several different solutions. Next, replacement of any well-worn parts is undertaken, followed by oiling & lubrication of jewels and other high-friction components. Finally, the watch is reassembled and tested to ensure that it is functioning correctly. Only a certified Omega watchmaker should attempt this type of repair, as it requires both training and experience and pose a risk as well as irreversible damage. If you have an Omega Speedmaster cal. 861 watch in need of repair, be sure to bring it to our Omega certified watch store in New York.