Thursday, September 1, 2011


In 1976, Seiko introduced its third model of diver's watch. This third model came in calibers 6309 and 6306 -the twin brothers conceived in 1975 and theircommercialization started in 1976. Seiko put 6309 and 6306 in production in 1976 but the 6306s came first.

The 6306s were intended for Japan domestic market only while 6309s for anywhere in the world. Production of these watches started from 1976 in Suwa Seikosha Japan but in 1981 Seiko discontinued 6306s and allowed production runs for 6309s to continue until 1988.

Both 6306 and 6309 diver's watch share the same basic specifications, except that 6306 is 21-jeweled, second-hand hackable and came with Kanji/English day wheel. Its brother 6309 came with 17 jewels and does not hack. Both run at 21,600 beats per hour (bph) with quick set day/date calendar mechanism and were originally rated to 150m WR.

The 6306s and 6309s originally came with "SUWA" dial variant with "JAPAN A"-signed back case
cover, except those 6309s produced in the latter of 1981 at Seiko Plant in Hong Kong.
The Seiko's third model of diver's watches (6306/6309) have proven their worth. For over 3 decades they have withstood the test of time. One can say with conviction that a 30-year-old of this model when overhauled, cleaned, oiled and regulated will live for another decades again. They are indeed the "workhorse" movements as described by their users/collectors around the world.
MOVEMENTORIGINAL AUTOMATIC MOVEMENT, Cal. 6306A, Seventeen (17) Jewels With Hacking Mechanism.
Professionally serviced just recently and is running well.
METALSolid Stainless Steel Case and Case back.
CASE 'n SIZEORIGINAL CASE. Professionally refinished to its original factory finish as close as possible.
Width: 44 mm excluding crown; length: 45mm from lug to lug. Thick: 13mm with bezel.
NEW aftermarket Hands.
STEM/CROWNORIGINAL STEM (male/female type) engages hands, day and date wheel as it should.
ORIGINAL CROWN it screws down securely at 3x180 degrees turn.
It Comes With English/Japanese Day Wheel.
CRYSTAL/Retainer RINGBrand New Aftermarket Hardlex Crystal Very Closer To Original.
Crystal is attached with crack-free ORIGINAL CRYSTAL-RETAINING RING NOT glued.
Rotating BEZEL 'n INSERTORIGINAL BEZEL RING rotates in bidirectional rotation with clicks.
BRACELET/STRAPIt comes on a Brand New Original Seiko Rubber Strap Z22.
FAT SPRING BARS are used in this watch as Seiko diver should come on fat spring bars.
SERIAL NUMBER, which dates production back on December 1977. She is 34 years old.
WATER RESISTANCEWater Resistant tested 150 Meters while diving in the pool.

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