I think that the Seiko 66B is the last mens manual wind that Seiko made even though it was hugely popular movement produced from the early 60’s through to the mid 70’s
Most of the models that used this movement where basic dress watches, plain design yet elegant, reliable, shock resistant, accurate and easy to repair…. a favourite with watchmakers. This particular model from 1965 was extremely popular and was one of the many Seikos of the period that catapulted the brand into the number one watch manufacturer in the world.

