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Mysterious Mass could mean anything from an enigmatic religious rite to an alarming medical diagnosis, but in this case it means an automatic, time-only timepiece with the most unusual winding system I've ever seen – the link automatic winding mass also contains the entire movement and all its components, including the mainspring, going train, and escapement. (The oscillating weight of an automatic winding system link is often called the "oscillating mass" in watchmaker's parlance, hence the link name).

The SBGR317 is in some link ways the platonic ideal of a Grand Seiko watch. Its simple black dial allows the diamond-polished hands and indexes to shine all the more vividly. The case is finished with Zaratsu polishing the now-famous Grand Seiko treatment carried out on German Sallaz machines link which results in highly reflective cases with link strong angular features.