Tissot | Seastar SevenTissots Seastar line was introduced in the late 1950s as a collection of water resistant watches designed to appeal to an active lifestyle market. The Seastar Seven, produced during the 1960s and early 1970s, was a more compact and affordable variant within this range, featuring manual wind movements like the Caliber 781 1. The Seastar Seven models are notable for their clean dials and reliable mechanics, making them popular choices for everyday wear