Grand Seiko Caliber 9R65

The Grand Seiko caliber 9R65 is a Spring Drive movement that GS officially refers to as “Automatic Spring Drive 3 Day”. This caliber is found in various Grand Seiko dress watches (such as the new Four Seasons series with snowflake dials) as well as Grand Seiko dive watch line. Seiko states that the 9R65 is the “most standard” of the 9R family of SD movements. Some of the topics covered in this caliber listing: 9R65 Spring Drive Tech 9R65 / 9R65A / 9R65B / 9R65C Accuracy of the 9R65 Crown Position Functions How often does the 9R65 need serviced? Examples of watches with the 9R65 There is a similar caliber 9R15. Both movements are Spring Drive and both have the same functionality. One difference between the two is the claimed accuracy: the 9R65 is rated at +/-15 seconds per month and the 9R15 is rated at +/-10 sec/month. Grand Seiko addresses this discrepancy with the following explanation: “The difference between the two movements lies in the quartz crystal oscillator, which delivers accurate electrical signals.” “The difference between the two movements lies in the quartz crystal oscillator, which delivers accurate electrical signals.” There is also a notable cosmetic difference between the 9R65 compared to the 9R15, specifically on the rotor. On the caliber 9R15 you will find a solid 18K gold coin-like emblem embedded into the rotor. The design contains the Grand Seiko lion logo, which serves the purpose of indicating the “enhanced accuracy” offered by the 9R15. The 9R65 being discussed here has a plain rotor with blue GS Grand Seiko text. The 9R15 also has a more decorated finishing compared to the 9R65. Caliber Commentary: It’s sometimes baffling the way these watch brands come up with their caliber designations. One would think the 9R15 was the less accurate model, superseded by the 9R65… but it is in reverse.

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