Vintage 1970's Seiko Turtle Automatic Diver Black 6309

Seiko first-ever released its original version of the “Turtle” dive watch collection back in 1976, with a reference number of 6306-7000/1. At first, this version was only produced to meet the needs of the Japanese market, but the brand decided to take it to the next level, conquering the global market. It is powered by a first-class in-house 6306A caliber and features a 60-click bezel around its black dial.  Later on, Seiko made its new version with a reference number of 6309-7040/9 for its global customers. There is only a very minimal distinction between a Seiko 6306A and Seiko 6309 version — the latter does not feature a hacking movement. Otherwise, the two versions are almost alike, offering robust and top-notch functionality over the years.