Simple. -63 is the year of conception...which...like a baby, takes X months to develop...and are thus born X months later.
No (or hardly any) of these watches were produced in the year stamped in the caseback...always a year+ later, depending on how long they were produced for...so if a watch conceived in year -XX was produced (and not changed) for Y years, there will be Y years worth of watches produced, with -XX stamped in the back.
Horrible looking thing that, there might be something else wrong with it...perhaps you should send it to me for inspection...
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