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Hamilton quality - The 10/12 sizes. "Click" to Login or Register 
Picture of Matthew E. Sutton
posted
...So the 918 was manufactured after the 920 and 922? Did the 918 have the elinvar hairspring? (1941).
 
Picture of Jerry Treiman
posted
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.
 
Picture of Matthew E. Sutton
posted
Here is a 918 since the image at the top has expired.

 
Picture of Matthew E. Sutton
posted
Stem view (The case was open in the back, so a gap appears)

 
Picture of Matthew E. Sutton
posted
Front view

 
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