The second model of Shanghai Calendar watch A623a is the upgraded version of A623 model. It has a upgraded A611a movement(with calendar function) which have semi-wuick-set calendar function (aujusted the calendar by setting 3hrs forward & backward at 12 o'clock).
It is the second generation of Shagnhai calendar watches production years 1965~67; one of a hard to find model of in Shanghai watch series.
