Birthday Watch December 1965! Seiko 6206-8040 Seikomatic SUWA 26J Automatic Watch (OH)

A BIRTHDAY WATCH IS A WATCH PRODUCED THE SAME MONTH AND YEAR AS YOUR BIRTH MONTH AND YEAR

Make: Seiko
Type: Automatic
Model: Seikomatic 
Year of Production: October 1965
Movement: 6206
BPH: 18,000
Number of Jewels: 26
Hand and Dial: 3D Baton Indices and Dauphine Hands
Width: 37mm
Lug to Lug Height: 42mm
Thickness: 11mm
Lug Width: 19mm
Strap: Brand-New Hi-Quality Two-Tone Genuine Leather Strap
Pouch / Box: Brand-New EVA Type Zipper Pouch

According to most reliable online sources, the Seiko 6206 movement made its debut in 1963. This movement was an improved version of the Caliber 400 (later 410) movement. In between these 2 movements were the 6201 and 6220. The 6201 was used in the first Seiko 5 Seikomatic but it was the 6206 that laid the groundwork for the 62xx series that brought forth the Grand Seiko to the world.

The 6206 movement is found in Seikomatic's and Weekdater's, and is highly sort after because its components were cannibalised for many more expensive watches, thereby this particular 6206-8040 is highly sort after due to its scarcity.

For Seiko Collectors and Vintage fans, this is a Seiko SUWA Seikosha Dolphin series. The dolphin was used to impress its higher waterproofing capabilities; hence, it was used by many for shallow diving instead of the typical diver's watch that coincidentally uses the 62xx movement as well when first introduced!

This extremely rare Seiko Seikomatic Two Window is a sight to behold! It's original milk white Dial and reflective Chapter Ring, 3D silver baton indices, logo, hands, date/day window, case and back case are in pristine condition after a good clean-up. The crystal has been replaced with an NOW Japanese Crystal.

The timeless masculine cylindrical shaped silver case was buffed as best as possible; however, there are some hairline scratches still present.

The crown is located at the traditional 4H position and is nicely tucked away to prevent damage or snags. The date and time quickset is via the traditional method of uncorking the crown to the first and second level for date and time adjustment respectively. The day quickset is via turning the hands forwards and backwards past midnight. Another unique feature is the day is only in English.

The movement was carefully stripped and meticulously cleaned via ultrasonic immersion, oiled, re-assembled and calibrated on 21 April 2026. In short, it underwent an overhaul and not a basic service. It should be able to operate unhindered until the next servicing thereby providing the owner peace of mind.

Equipped with the well revered 6206 movement, it has 26 Jewels that operate at 18,000 BPH). The time-grapher shows excellent readings of 4 seconds and amplitude of 208 with a straight line! Such readings are exceptional even by brand new modern automatic watches whereby the accepted tolerance is -20 to +40 seconds a day! This is a testament to the quality, the meticulous care provided over the years, and of course the painstaking expert calibration.

To the best of our knowledge and expertise when overhauling the timepiece, the watch is 100% original Seiko components from this particular watch. No parts were replaced with aftermarket parts or modified.

Due to its age, this timepiece has not been water-resistant tested.

The case width and height are approximately 36.2mm (without crown) and 41mm respectively. The lug width is 19mm and the strap can accommodate wrists up to 15.5cm; hence, this watch is suitable for men and the modern women.

A beautifully crafted high-quality Super Engineer SS Bracelet with built-in extension comes as part of the deal. It too underwent a thorough cleaning and polish and is now in excellent condition.

The pictures provided show the watch in pristine condition (no dents, dings and major scratches), and the movement within squeaky clean and well maintained. It has also been demagnetised to improve parts reliability, minimise wear + tear, and improve accuracy. The only drawback is the lack of documentation and original box. An aftermarket box or purposeful carrying case will be provided instead.

Seldom can one find a vintage watch that offers this and more. Yes, there are many other same / similar models in the market, but none are as well-kept and maintained as what you see here, and with an attractive price to boot. So, it is a no-brainer that this one-of-a-kind timepiece will make an extremely beautiful birthday present for that special someone born in December 1965!

Bear in mind that this watch has seen many of the previous owners’ ups and downs in life and should be cherished and well taken care of for the next generation to savour such engineering beauty.

This particular model is valued between S$ 350.00 to S$ 558.00 on various auction / online sites from really horrible, to un-serviced, to "as is," to refurbished, to pristine condition. NOS / Fully Restored models are valued at S$ 1,122.00. Note: the mentioned prices do not include currency conversions, commissions, taxes and freight costs etc.

This fully overhauled and calibrated timepiece is being sold here for S$ 399.00 which is extremely reasonable.

Do also bear in mind that it will cost between S$ 180.00 to S$ 200.00 for a proper overhaul, an estimated S$ 80.00 to calibrate (depending on watch condition), and S$ 100.00 to polish including tightening of bracelet links - these costs do not apply when purchasing this timepiece. So, if anyone was to sell such a timepiece at a low price yet claim that it has been serviced, one has to ask what kind of servicing was conducted, if any.

This is a truly magnificent December 1965 Seiko Seikomatic SUWA Two Window watch in immaculate condition with a beautifully preserved vintage dial, immaculate indices, hands, movement and case; so, be unique and own a December 1965 Birthday watch that is almost impossible to source in such fine condition or purchase it for that special someone.