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...So the 918 was manufactured after the 920 and 922? Did the 918 have the elinvar hairspring? (1941).
The 918 was after the 920. Production began a few years after the 922 but then was roughly concurrent. I do not recall ever seeing one with an elinvar hairspring.
Here is a 918 since the image at the top has expired.
Stem view (The case was open in the back, so a gap appears)
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