![]() The accuracy of mechanical watches may not fall within the specified range of time accuracy because of loss/gain changes due to the conditions of use, such as the length of time during which the watch is worn on the wrist, arm movement, whether the mainspring is wound up fully or not, etc.Seiko claims an accuracy rating of -15/+25 seconds per day in normal temperature conditions (between 5 – 35 degrees C). Seiko Instruments (aka SII) sells the NE15 to other manufacturers (such as microbrands) for use in non-Seiko watches. The caliber 6R15 is basically a Seiko-only version of the NE15. The jewel count on the 6R15 is 23, while the other calibers have increased jewel counts to accommodate the additional features. Other than complications, another difference between the base 6R15 and the variations is that the 6R15 beats at 21,600 and the other calibers beat at 28,800 with power reserve that drops from ~50 hours to ~45 hours. The 6R15 only has the hours, minutes, seconds, and date. The 6R27 has a power reserve indicator and date subdial. Which also explains why the 6R24 has 31 jewels instead of 29). The 6R24 has a retrograde day of the week indicator at 3:00 (as well as a retrograde date indicator at 6:00. The difference is that the 6R20 and 6R21 have a day of the week subdial at 3:00. What are the differences?Īll additional variations above have the power reserve indicator at 9:00 and a date subdial at 6:00. The caliber 6R15 is the base caliber for the 6R20, 6R21, and 6R24, and 6R27. Note: apparently some early versions of the 6R15C only have 23 jewels compared to the newer ones with 24J. As of the time of this post, the latest stable version of this movement is the 6R15D (if this changes, please update the comments below). Because of the changes, not all parts are interchangeable between the variations. Early models of the 6R15 (A, B and some early C) were prone to issues that Seiko improved upon over the years. The subsequent letter variations indicate evolution stages in the movements development. The general caliber number is 6R15, with 6R15A being the first version. Some of the topics covered in this caliber listing:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |