GRAND SEIKO Sports Collection MAGNETIC RESISTANT Model SBGX341 Made In JAPAN. From the Sport Collection" Tough GS "series with high-spec functions, a reinforced magnetic resistance (40000A /m) model with even higher specifications and lightness is now available. A functional case design that is created as a result of removing unnecessary elements like a professional gear (tool) that protects the contents with a hard appearance while making use of the tough GS's solid modeling that mainly consists of vertical lines. While having a magnetic resistance of 40000 A /m, which is higher ...