Thanks @minutenrohr and @DirtyDozen12 for weighing in on this watch. I concur with the assessment that these were later re-cased by a French dealer/agent. I think Wittnauer or US dealers did a bit of that too. Given that, would you consider that it is a legitimate Longines; would the re-casing history affect the value? I would say that it does but given that there is a whole bunch of them and that it reflects the commercial practices of the days, these are still highly collectable in my opinion (although $7500 seems to be a bit steep).