1976 Seiko 6306-7001
Brand
Seiko
Series
Turtle (6306 JDM Version)
Catalogue Reference
6306-7001 683364
Production Year
1976
Movement Type
Automatic (Self-Winding)
Style
Dive Watch
Date
A feature that displays the current day of the month, typically in a small window on the dial, commonly placed at the 3 o'clock or 6 o'clock position.
Automatic
A watch powered by automatic (self-winding) movement that doesn't require a battery. It winds itself using the daily usage motion of the wearer's wrist.
150 meters
Suitable for swimming, snorkeling, and light diving, but not recommended for high-impact water sports or scuba diving.
Bi-directional rotating bezel
A bezel that can rotate in both directions (clockwise and counterclockwise). It is useful for timing events, measuring elapsed time, or reading a second time zone.
Case
Diameter
43 mm
Thickness
14 mm
Material
Stainless Steel
Water Resistance
Waterproof up to 150 M / 490 feet
Finishing Details
Subtle Radial Polished
Bezel
bi-directional bezel, 10-minute graduated
Crown Type
Screw Down
Crystal
Mineral
Caseback
Brand decoration and details engraved
Dial
Color
Black
Dial Markers
Arrow Indeces
Finishing Details
None
Luminiscent Indexes
Hands and Markers (Trititum)
Calendar
Day/Date display at 3 o'clock position
Bracelet
Material
Leather
Buckle Type
Butterfly Deploy Clasp
Width
22 mm
Color
Red
Seiko 6306A
In-house Seiko movement produced from around 1976 until 1981.
The cal. 6306 movement has 21 jewels and runs at 21,600 A/h. It hacks and has a quickset day/date calendar mechanism with a Japanese/English day wheel
The 6306 divers are much rarer to find since they were Japan-only models that use a 21 jewels hackable movement (compared to the 17 jewels non-hacking movements in the 6309s).
From the serial number, the watch dates to August 1976, beeing assembled in the first year of the model release.
Manufacturer
Seiko
Model
6306
Type
Automatic (Self-Winding)
Frequency
21600 A/h
Jewels
21 (Twenty-One) Jewels
Reserve
45 Hours
Functions
Day, Date, Hours, Minutes, Sweep Seconds