As for the SUMO series, caliber 6R15 runs some magnificent examples such as: Nowadays, due to its great accuracy and durability, caliber 6R15 is running some quite serious pieces from SUMO, 62MAS and SARB series. Seiko caliber 6R15 became famous by Seiko’s SARB (Spirit) series on Japanese market and its fame went global with Seiko’s “ SUMO”, “ Alpinist” and “ 62MAS Re-edition” watches series a bit later.Įven though Seiko introduced newer calibers after it, caliber 6R15 is still one of the most appreciated ones. It is just a step below “high-beat” movements, but has greater power reserves and a great accuracy (compared to the “high beat” calibers) due to its Spron 510 mainspring. It operates with 23 jewels, beats at 21,600 vph and holds magnificent 50 hours of power reserve with +25/-15 sec/day, which makes it quite a premium workforce. Seiko 6R15 caliber basically adds hand winding and hacking mechanism to 7S26 and is yet less expensive than most of the mainstream Seiko movements. ![]() All of the famous Seiko calibers above are parts of so called 7S family because they are based on 7S26 Seiko movement.īut, ever since caliber 6R15 is produced in late 2005, it proudly stands as one of the best Seiko watch movement and most commonly used calibers in modern watches. But those calibers that made the difference in the modern age followed the introduction of a previously mentioned Spring Drive movement and caliber 6R15 is one of them.īy some, caliber 7S26 is Seiko’s best earner and it was used in several Seiko diver watches, but the three most popular Seiko calibers nowadays are surely caliber 6R15, 4R35 and its close relative 4R36. For example, caliber 6217 incorporated in Seiko Diver’s 150 m in 1965, caliber 6139 made famous by Seiko 5 Sports Speed Timer in 1969 and caliber 35A in Seiko Quartz Astron in 1969 are all great old-timers. When it comes to Seiko, there are several calibers that marked its history. Shop Angus-J Louis JUB Watch Band compatible with Seiko Sumo The calibers are typically marked with their model number, often together with the design number, such as caliber 6R15-02T0, which marks the back of the case of Seiko Sumo SBDC027 Prospex Diver Automatic 50th Anniversary Limited Edition. Therefore, there is no need to manually wind these calibers. Automatic or self-winding calibers (to whom caliber 6R15 belongs) are the most common today and their mainspring is powered by the motions that people naturally make while wearing a watch. Manual or hand winding calibers need occasional turn of the watch crown to wind the mainspring in order to store the energy needed for their work for some time (this is called power reserve). Bridge movements, also called three finger or Geneva movements were used at the beginning of 20 th century and when it comes to modern watch calibers, they are classified as manual and automatic movements. Three-quarter movements were somewhat thinner than former and were used in 18 th century. Full plate movements are the oldest and were used in earliest watches, mostly pocket ones. Each movement is made of its power source, wheel train, escapement and oscillator. The same caliber is often used for many different watches (and as you will see below that caliber 6R15 is one of the most used in Seiko’s watches). The origin of the term can be tracked down to mechanical watches, whose calibers are made of many moving parts. ![]() ![]() In the wonderful study of time called horology, a caliber (also known as movement) is the mechanism of a watch. ![]() And before we analyze the characteristics of some of their top ones (such as the prized caliber 6R15 from the title), let us first break down what exactly is a caliber and why it is important, for those who are less familiar with the term. Around 600 prototypes and almost 30 years later, Seiko made his famous Spring Drive that made the difference among mechanical watches because it brought a new level of accuracy.Īlthough Seiko takes pride in some of its old calibers and continues to resurrect them, they never stopped introducing the new ones. But in 1977, another visionary at Seiko came up with the idea of “the everlasting watch”. Ever since Kintaro Hattori made Japan’s first wristwatch in 1913, the quality of Seiko watches could measure with top Swiss manufacturers.
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