SEIKO AUTOMATIC SEE~THRU CASEBACK BLACK PRESIDENT DIAL WATCH+++VERY RARE MODEL+++

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**VERY RARE MODEL**

Seiko
Automatic

SNK623K1

Dial Color: Black Dial
Gender: Men's watch
Water Resistant: 50 Meter 5 Bar
Case diameter: 37 (crown) x 35 x 12 mm (thickness)
Face Height: 29
Lug Width: 20
Max Length: 230 mm Circumference wrist
Japan Movement: 7S36 21Jewels Automatic
(Watch with a balance wheel to regulate time and a mainspring as its source of energy. The mainspring is wound by the movement of the wearer.)
Timekeeping Accuracy :+/- 15s/day
Seiko Stainless Steel Case
Seiko Stainless Steel Bracelet
Three Fold with Push Button Release Clasp
See Thru Screw Down Case back
Lumibrite Hands and Markers
Scratch Resistant Hardlex Crystal Glass
Display Date at 3 o'clock position
Display Day at 6 o'clock position
Date in both English & 4954628013705
Crown at 4 o'clock position
Weight: 133g

Nice unbranded giftbox, no manual.

**All Automatic Watch will gain / lose time:-
All automatic watches will gain or lose time when they are new or not worn on the wrist all the time.
According to Seiko Corporation, the timekeeping accuracy of the 7S26/7S36 movement is +-15 s/day. It has been known that this movement typically runs fast for a few weeks when fresh from the factory sometime get as far as +45 to -35 s/day. Also it keeps better time when worn on the wrist all the time. If you¿re not wearing the watch for more than its 42 hour reserve, you¿ll have to rotate it to keep it going or reset the date/time. The watch will "settle down" to a more reasonable accuracy level after being worn for a couple of months.

If your watch loses or gains a few seconds per day, you can take it off at night and :-
1. Lay the watch flat with the dial uppermost (To gain a few seconds if it is slow).
2. Lay the watch vertically with the winding-button downwards. (To lose a few seconds if it is fast)
3. Lay the watch vertically with the winding-button uppermost. (To lose more seconds if it is too fast)