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The Seiko 4R36 et al movements appeared sometime during mid 2011 and much excitement ensued simply for the fact that Seiko was now equipping relatively run of the mill watches with a movement capable of being hand-wound and hacked. Here and there on various watch fora have appeared pretty in depth posts regarding the construction of the "new" 4R movements and I certainly wouldn't attempt to replicate those here. Suffice to say, the precursor to the 4R family was the 6R15 and this movement was initially used to power the likes of the Japanese market SARB (Spirit) series, introduced late 2005 and the now highly regarded SBDC001 'Sumo' dive watch, introduced early 2007. The 6R15 was notable for the same reasons as the later 4Rs - hacking and hand-winding; in addition, the 6R15 featured a Spron 510 mainspring which gave the caliber a power reserve of over 50 hours once fully wound.
Item created by: Lethe on 2015-08-10 17:29:01
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