9,1 / 10
Extremely rare 4520-8000 Series
Within the 45 Series there are different combinations of cases, calibers and materials (steel, gold plated or solid gold in the 8010 version), but for all those looking for a 36’000 beat per hour caliber without date and with sober but tightly fitting lines according to the dictates of Grammar Of Design, the 4520-8000 is undoubtedly the right choice.
This rare example, dated December 1969, is in excellent condition, all its parts are compliant, case back medallion included. The case still has its typical factory workmanship with sharp corners divided between satin and polished surfaces. The caliber has been overhauled in January 2022.
About the model
Born in 1968 as the second and last line produced by Daini Seikosha for Grand Seiko, the 45GS is still today the only manual-winding men’s watch at 36’000 beat per hour in the Grand Seiko history.
Like its predecessor 44GS, the design of this model faithfully respects the stylistic features of the famous Grammar Of Design, distinctive elements that will permanently mark the Grand Seiko Style.
Three calibers supplied on this line, the 4520A (time only), the 4522A (date at three o’clock with quick release), and the 4580 V.F.A. (Very Fine Adjusted).
The 4520/22 series was declined in 4 case variants:
- the 7000, a cuschion shape characterized by very angular contours, edges and corners and alternating glossy and satin surfaces,
- the 7010, characterized by a softer and oval shape with a satin finishing,
- the 8000, typically adhering to the Grammar of Design,
- and finally the 8010, cushion shape in 18K gold with a ’’texture’’ finishing.
Both the 4520 and 4522 calibers were born from the experiences of Daini in Swiss chronometric competitions and made it possible to achieve a higher level of precision with a Seiko ” AA ” adjustment standard of -3 / + 5 seconds per day.