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I have a straight forward (time and date functions) early seiko LCD model number 0432-4000 serial 600.857. How would I go about finding out the production date for model ?
 

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Early , so seventies. Serial starts with 6, so 1976. Are you sure about the following zero? That should mean October, if i'm correct. (N is November, D is december, 1 tot 9 the other months)
 
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