It's also good to remember that in the late 60's-70's the Swiss watch industry was just being hit by the quartz/Japan avalanche. Keeping track of movement numbers and exactly what watch they were used in for posterity was probably not high on their priority list. You see this over and over with companies that after several decades, find their products "collectable heirlooms". Honestly it's nice to see that they still have records at all. My research into a Longines/Wittnauer watch reached a dead end because Wittnauer, having gone through many corporate changes, has no records to speak of, at all and does not apparently have anyone in customer service who knows anything about watches either.
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