Seiko “Square Eyes” Kakume 6138-0030Model: Seiko Square Eyes Kakume 6138 0030 Year: September 1975 Features: The Origin. You cant talk about the 6138 calibre without talking about the 6139 first. In the late 60s, an intense and very public race to produce the worlds first automatic chronograph was reaching its conclusion. The Race. Zenith drew first blood with an announcement of a working automatic chronograph prototype in January 1969. Three months later, the Chronomatic Group