New find: Seiko 7C43 from the 80’s. Previous owner is not entirely certain but says it might be from my birth year.

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Very cool! It's interesting to know that the design hasn't changed much over the years.

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You can check the serial on an online calculator and it should give you the year of manufacture.

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Serial starts with 9 so this is a watch made in a year ending with 9. Case back battery change indicator shows the 1st change in ‘93Q1 so I’m pretty certain myself that this is my birth year watch.