Birthday Watch December 1963! Seiko 820 Sportsmatic Calendar DAINI JDM 17J Automatic (OH)

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

Make: Seiko
Type: Automatic
Model: Sportsmatic Calendar 820
Year of Production: December 1963
Movement: 820
BPH: 18,000
Number of Jewels: 17
Hand and Dial: 3D Gold Baton Indices with Dauphine Hands
Width: 36.3mm
Height: 42.4mm
Thickness: 11.3mm
Lug Width: 19mm
Strap: Brand-New Hi-Quality CITES Approved Genuine Python Leather Strap with Gold Buckle
Pouch / Box: Brand-New EVA Type Zipper Pouch

According to most reliable online sources, the Seiko 820 Sportsmatic Calendar debuted in 1963.

It was circa 1964 that Seiko began officially re-naming their 3-digit models into 4 digits. It did not occur overnight but was a gradual process due to the number of existing / operating calibers; hence the 820 is AKA the 7625A.

Originally meant for the Japanese market, this is a highly sort after collectors watch and its "AD"(Applied Dial) status makes it even more desirable to own, and it is almost non-existent as well.

For Seiko Collectors and Vintage fans, this is a December 1963 Seiko Sportsmatic Calendar 820 DAINI (with Spinning Top) in superb condition. I daresay it may be one of the earliest models produced in December 1963 - the year it wa launched.

It's original sunburst ivory-white dial, indices, hands and date window had undergone a painstaking cleaning process, and almost all imperfection have been meticulously removed. They are now in stunning condition. The crystal was replaced with a Japanese Seiko Approved Crystal and given a good buff.

Its gold case was cleaned and given a good buff; however, minor scratches, age marks and wearing out do remain.

The entire movement was carefully stripped, meticulously cleaned, oiled, re-assembled and calibrated on 18 July 2026. It should be able to operate unhindered until the next servicing thereby providing the owner peace of mind.

The crown is located at the 4H position. The date and hands operate in the traditional manner by uncorking and rotating the crown that works as it should.

Equipped with the classic 820 movement, it has 17 Jewels that operate at 18,000 BPH. The time-grapher shows excellent readings of +6 seconds and amplitude of 164 with a relatively straight centered line! Such readings are truly exceptional even by brand new modern automatic watch standards 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 the painstaking expert calibration conducted.

The case width and height are approx. 36.3m (w/o crown) and 42.4mm respectively. The lug width is 19mm and the genuine leather strap can accommodate wrists up to 20.0cm; hence, suitable for men and the modern women.

The watch comes with a brand new hi-quality CITES Approved Genuine Python Leather Strap with gold buckle.

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 or modified parts.

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

The pictures provided shows the watch in excellent condition, 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. A brand-new EVA pouch is provided instead.

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 vintage watch will make a beautiful birthday present for that special someone born in December 1963, and its value will appreciate over time.

This is an extremely rare December 1963 Seiko 820AD Sportsmatic Calendar 820 Watch; so, be unique and own a rare December 1963 Birthday Watch that is almost impossible to source in such fine condition or purchase it for that special someone instead.