In early 2016, I began to collect data on Longines' Marine Nationale watches. My primary objective was to make sense of the different dial types that I had observed. With an admittedly small sample size, a pattern emerged. Three distinct dial designs that were produced consecutively with very little, if any, concurrence. I posted this information in a summarized form here: https://omegaforums.net/threads/marine-nationale-longines.35401/page-2#post-429837 Now, I have been encouraged by a fellow OF member to post my data. I was reluctant in the past as I did not want the information to be misused. This has become a moot point, it seems, as much has been written/published on these watches. Hopefully some find the information below useful or interesting. And feel free to share the details of your example if you do not see it in the spreadsheet.