Seiko Credor 2620-0120 - October 1979
Today, Credor stands as one of Seiko’s most distinguished watchmaking names. However, in 1979, Credor was merely five years old, and its identity was not yet as independent as it is today. At a time when quartz technology was transforming the world, Seiko utilized this new brand to produce watches that were not only more precise but also thinner and more refined.
**IMPORTANT NOTE: As this item ships from within the European Union, you will not be liable for customs duties within the EU.**
The 2620-0120 model originates from this very early period of Credor’s history.
The serial number 900355 on the case back dates the watch to October 1979. In the code 2620-0120 B, the first four digits denote the internal movement family, while the second section indicates the case design. The watch is powered by the Calibre 2620A, developed by Daini Seikosha.
The 2620A is a prime example of how the quartz revolution was defined not only by high precision but also by miniaturization. Measuring just 17.6 × 16 mm and approximately 3 mm thick, this two-jewel caliber operates at a frequency of 32,768 Hz and delivers an accuracy of approximately ±15 seconds per month, according to specifications from that era.
This compact movement does not feature a date display; instead, the entire design focuses on creating a dress watch that is as slim and minimalist as possible.
With a diameter of approximately 33 mm and a lug-to-lug measurement of 38.5 mm, the watch maintains the elegant proportions characteristic of classic men's watches from the late 1970s. The vertically textured silver dial is complemented by slender, gold-toned indices and hands. However, the most important detail on the dial is actually hidden in the brand name:
"SEIKO" still appears right beneath "CREDOR."
Today, the Credor name stands strong on its own. Yet, in 1979, the brand had not yet visually separated itself from Seiko. This dual signature is a small but highly significant detail that directly links the watch to the early days of Credor’s history.
The bezel surrounding the case is far from ordinary, too. Gold-toned, stepped elements spaced around the perimeter reappear on the clasp, echoing the same geometric rhythm. A black, domed crown completes the two-tone aesthetic. Thus, the bezel, clasp, and case cease to be separate decorative choices and instead become integral parts of a unified design.
The watch comes with a green Seiko box from the same era. While the box is period-correct, there is no specific documentation confirming it has accompanied this watch since its original sale.
Final Thoughts
The true significance of this Credor lies in more than just its status as a slim 1979 quartz watch. The "CREDOR / SEIKO" dual signature on the dial captures a brief period before the brand began to stand entirely on its own. Dating to October 1979, the 2620-0120 is a small yet deeply meaningful piece from Credor’s formative years—before it evolved into the brand we recognize today.
The product shown was manufactured in 1979.
IT HAS UNDERGONE A COMPLETE PROFESSIONAL SERVICE.
The movement was fully disassembled; every component was cleaned, lubricated, and precision-adjusted to ensure flawless operation. (It requires no further maintenance for three years, provided it is not exposed to adverse conditions.)
Product Condition: Tested; all functions are fully operational.
