Cartesian
·The marks on the case-back here suggest the watch has been serviced at least three times:
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Notez également qu'il s'agit d'un boîtier de montre de fabrication américaine, ce qui est intéressant.
Just a thought regarding the letter 'E': maybe the typeface was like that back in the 1950s and the 'E' changed over time? I took it to a jeweler—the highly reputable Fournier jewelry store—to have the O-ring replaced. He noticed the tiny groove on the crystal and said it was the original one, meaning it had never been removed... so... I'm certainly no expert, but his reasoning makes sense.
It is very possible that the crystal is original still, while the dial has been re-touched during one of the times when the watch was serviced
The marks on the case-back here suggest the watch has been serviced at least three times: