This exerts an effect on the accuracy of the watches. The key components in mechanical watches are made of metals which expand or contract depending on temperatures due to metal properties.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 the accuracy of the caliber 6R35 has a rating of -15/+25 seconds per day in normal temperature conditions (between 5 – 35 degrees C). This post will be updated if the movement gets any upgrades.

The subsequent letter variations indicate evolution stages in the movements development. The general caliber number is 6R35, with 6R35 A being the first version. This is still a rather new movement, so currently there is only the 6R35A.

The 6R15 has a power reserve of approximately 50 hours and the 6R35 has a power reserve of approximately 70 hours. The biggest difference between the two movements is a 20 hour increase in power reserve. The caliber 6R35 is beginning to find its way into watches that used to house the 6R15. Some of the topics covered in the caliber listing: The Prospex SPB149 powered by the 6R35 was announced in March 2020.

Watches with the 6R35, such as the Presage Arita Porcelain were announced at Baselworld 2019. The 6R35 is considered an upgrade from the caliber 6R15. The Seiko caliber 6R35 is an automatic movement that is part of what Seiko refers to as the high performance 6R series caliber. Hours, minutes, central second hand, date at 3 :00

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