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Edge gasket in snap back cover (?) - Hamilton auto


Question

I just cracked open a recently acquired Hamilton auto and came across something for the first time. It appears that in addition to the flat gasket inside the case, there is a groove in the snap back cover with remnants of another gasket.

Is this correct -- that there is supposed to be a thin gasket in the cover and in the movement? Sure looks that way.

 

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Looks like a 'belt and braces' approach, how is the crown sealed to the case? One would hope that with the attention to the back seal there would at least be a seal in the crown....

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