The 21 jewel 6138A released in 1970 was the first fully integrated automatic chronograph with a column wheel and vertical clutch coupling mechanism. Some time later, they switched to the 23 jewel 6138B. http://www.watchesuuk.co They are both automatic (rotor winds in both directions like most Seiko calibers) and hand windable, which is uncommon in vintage Seikos, and the day and date feature a true quickset mechanism.
The 0030 came in two color designs, a blue dial with square silver subdials and blue tachymeter bezel, and champagne dial with square black subdials and black tachymeter bezel. There are two further variants of each of the color schemes. One is badged “5 Sports, Speed-Timer” on the 9 o’clock side of the dial and has steel dauphine-esque hands.
These combinations of dial and hands are the most commonly seen, however I have seen either set of hands on both dials. Not sure if they left the factory that way, or if they were swapped or what.
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