Birthday Watch December 1963! Seiko Sportsmatic Calendar 820 Ref: J15040D 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 was launched. Its 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! The case width and height are approx. 36.3mm (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. This is a highly sort-after Collectible Seiko Sportsmatic Calendar 820 DAINI JDM in superb condition; so, be unique and own a December 1963 Birthday Watch that is nearly impossible to source in such fine condition or purchase it for that special someone instead.