Consequently the majority of model numbers are odd but there are still a significant quantity of even numbered models. stainless steel, titanium, white gold etc. If the bezel material is yellow or rose gold the model number will be even. For watches with different bezel material e.g. The number also indicates the material that the bezel is made from. The second part of a model number is a unique three digit number that identifies a model within the series. Presumably if Grand Seiko were to introduce a new automatic Spring Drive calibre that featured a date, chronograph, and GMT complications these would be released under a new SLGC series. The SBGH and SLGH series both feature Hi-Beat automatic movements with a date complication. These new series align with the previous ranges with both the SBGA and SLGA series featuring Spring Drive automatic movements with date and power reserve.

In 2020 two new calibres, and consequently new series, were introduced with the SLGA and SLGH. The characters Q, O, U, and I were avoided to avoid confusion with 0, V, and 1. Eventually almost all characters were utilized, with a few characters skipped to avoid confusion. This is due to the reduced thickness of the 9SA5 caliber itself, which has a power reserve of 80 hours, an accuracy rate of +5 to -3 seconds per day, and a rate of 36,000 bph.Date,, Ĭonstant Force Tourbillon, Deadbeat Seconds, Power ReserveĪs the calibre types expanded additional series were added with the last character in the four changing, e.g. The case measures 40mm across and 11.7mm in thickness, making it thinner than many of the modern 44GS models offered in the past. This is the first continuous production Grand Seiko watch to feature Ever-Brilliant Steel.

Visually, it also has a brilliant white hue that enhances the beauty and Zaratsu finishing of the watch.

It has a PREN (Pitting Resistance Equivalent Number) value 1.7 times higher than that of the grade of steel used in most high-class watches. The case and bracelet are made of Ever-Brilliant Steel, a stainless-steel alloy that features even greater corrosion resistance than what is typically used across the watch industry today. The combination of a flat dial and a wide opening lets light pour in and create an ever-changing background against the razor-edged, multi-faceted indexes and the hour and minute hands show their brilliance. The timepiece features a light blue dial that expresses the distinct texture of the snow on Mt. Iwate, the imposing 2,038-meter-high peak that overlooks Grand Seiko Studio Shizukuishi where all Grand Seiko mechanical models are made, serves as inspiration for the modern Hi-Beat 36000 reference SLGH013.

Seiko watch serial numbers reference