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"The 4S reached its peak form in 2004. The 4S76 is the highest grade 4S Series, and incorporates 4 different types of complications--Independent GMT, Power Reserve, Retrograde Day, and Date Indicator. The 31 jewels gilded movement equips the current Credor 4S76 Node...
It was also in 2007 that the latest addition to the 4S family was conceived at Shizukuishi. “Conceive” might not be the most appropriate word to use, as the new calibre was, in fact, an
undecorated version of the 4S76, with identical technical specifications, as well as identical accuracy range (-10/+15 sec per day). The hand-assembled 31 jewel, 28’800 A/hr movement features Independent GMT-hand, Power Reserve, Retrograde Day, and Date Indicator. This calibre is known as 4S36, and along with the 4S76, are the highest grade non-GS mechanical movements produced by Seiko.
The brief of the 4S36 was simple: to be the flagship of the Seiko Mechanical product line. The only models of watch currently offered with this latest 4S are the SARN001 (black dial on bracelet) and SARN003 (blue dial on straps), both referred to collectively as SARN. They are the only watches in Seiko Mechanical line that are made by the Shizukuishi Watch Studio in Morioka."
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http://timekeeper.co.nz/viewtopic.php?f=20&t=763