The caliber 280 was introduced in 1958. It was Longines first manual wind with direct drive center seconds. (280 = no-date / 281 =- date) In the mid 60's, Longines made several modifications, which changed the 280 to the 284 and the 281 to the 285. The watch might date as early as 1965, and could be as late as the early 90's.
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