... where I saw this exact watch in the window of our local Zenith dealer. I thought by myself: "Ay, what a nice watch!". At first, I assumed it to be an earlier Charly Vermot edition, due to the blue dial, until I saw the windows of the full calendar indication.
Nice to find this review here, which explains everything. Had I seen it a month earlier, I might wear it now. Well, maybe later. I never had a cal. 410, only 400s.
Marcus