The Seiko 5606-7100 is a vintage automatic watch that was first introduced in the late 1960s. It is part of Seiko's Seikomatic line of watches and is known for its simple and elegant design.
The Seiko 5606-7100 features a stainless steel case and bracelet, with a black dial and silver hour markers and hands. The watch is powered by a Seiko 5606 automatic movement, which is known for its accuracy and reliability. One of the most distinctive features of the Seiko 5606-7100 is its day function, which is displayed in a  window at the 9 o'clock position. The watch also features a screw-down case back, which helps to ensure water resistance. The Seiko 5606-7100 is considered to be a classic vintage watch and is highly sought after by collectors and enthusiasts. Its simple and elegant design, reliable movement, and historical significance make it a popular choice for those who appreciate the craftsmanship and design of vintage watches.