Here is an insight into the rebuilding of an Omega Seamaster bumper automatic 344 calibre movement from 1952. I am not going to give a step by step dismantling procedure. Apart from the auto-wind mechanism, the dismantling is fairly standard. I will however give a couple of tips on how to safely remove the auto-wind mechanism, before showing assembly of the cleaned movement. The Omega bumper mechanism has three clicks A, B & C. The first A is mounted on the ratchet lever and trans