Jedan od retkih kvarcnih satova koje bih trpeo na ruci. Ako je original, a meni se čini da jeste, trebalo bi da izgleda kao na ovoj dole sličici. Krunica, poliranje stakla i čišćenje drikera nisu preveliki izdatak, tako da, za te pare, ako ti se dopada, pazari. Evo i nešto hvalospeva o tom mehanizmu:

High-end quartz-controlled chronographs hold a historical significance in horology. In 1983, SEIKO introduced Cal. 7Ax8--the world's first analogue display quartz chronograph, pre-dating both Jaeger-LeCoultre/IWC Cal. 631 and Piguet Cal 1270/1 Rattrapante.
The 7Ax8 mechanism is fully-jewelled (15), with all-metal gears (no plastic parts) and a calibration pot that allows for simple regulation by the user. Four independent step motor is provided for each indicating function. Despite all the traditional mechanical look and feel, timekeeping is quartz-accurate. Indeed, the 7Ax8 series is among the finest quartz chronograph ever produced by SEIKO or any other manufacture.
The Quartz Chronograph 7A48-7009 on auction was also called "The Tide Watch" and features a very accurate moon phase sub-dial that also accommodates a Date hand indicator. Being one of SEIKO's most expensive models in the late 80s, this moon phase chronograph would have retailed for around $825 at the time. This, understandably, makes it rarer than most other 7Ax8s. This very same calibre was also used in the Cartier Ferrari watch of the same period, though the 7A48-based Cartier now sells on the used market for around $2,000.
MOVEMENT: Quartz Chronograph Cal. 7A48, 15 Jewels, 4 Independent step motors, Elapse time to 0.05 sec accuracy, Split-Second, Date (hand-indicating), Moon phase