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So glad to have found this outpost of expertise. I have two 1958 Seamaster Calendars (one inherited, one purchased) and have always wanted to know a bit more about their technical specification.
 
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We will need better photos if you want help. Practice taking photos in natural light from various angles. Just delete the crappy ones and post the good ones. There's really no point in posting blurry and poorly lit photos. I'm sure you can do it with a little effort.

The serial number is on the movement and the reference number is inside the case-back. So remove the back and post photos of the inside.