Here is a Tissot Seastar automatic from the late 1960's. The stainless steel case is solid, thick and heavy. The case is measuring at 38mm in diameter without the crown. It has a fluted bezel and an acrylic crystal. The crown is signed with a big "T" of Tissot. Inside the case is the Tissot & Fils 784-1 movement with 21 jewels and a frequency of 18,000 A/h. It has a power reserve of 45 hours. The movement was made between 1965-1968.