Citizen Crystal Seven Automatic ACSS 2822a

It's New Years Eve, and they say it is "Out with the old..." so I'm finishing the year with a vintage watch.

Today's watch is a Crystal Seven Automatic watch by Citizen. The Crystal Seven watches came out in December 1965 and were one of Citizen's most popular lines. They were slim designed models with Sapphire glass and were variations on the 52xx movement. On the back it mentions Para (for the parashock movement), water (for the water resistance), and Star (which I don't know). The Crystal Seven logos are a 7 inside a crown on the front, and a 7 inside a shield with a crown on the back.

This model is the ACSS 2822a and is based on a 21 jewel automatic movement. Looking at the serial number, I think this model is from 1968. It has a 3 hand dial with a 14,400 bph seconds hand. At the 12 o'clock position is a day window (in a flattened hexagonal shape), and there is a date window at the 3 o'clock position. There is also the number 1580-IKA in very small writing on the face at the bottom edge of the dial.