I am considering buying the 856 because of tegimented case. However it seems that the watch also has copper sulphate capsule and inert gas filling which I am not really interested in. I have been doing some research and it seems good quality watches are expected to continue to work without service for a lifetime.
Considering that I am going to be using my watch mostly for work sitting at desk, does changing those copper sulphate capsules really required? Should I forego the tegimented case and consider the 556? The thought of servicing a watch unless it is broken does not inspire me.