This is due to the inclusion of plastic parts which reduce the need for frequent lubrication for maintenance. The NH35 is based heavily on the workhorse Seiko 7S26 movement which is known to last upward of 5-25 years without ever needing a service. However, most NH35 owners find their movements to run much more accurately, often between -/+ 1 second to -/+ 10 seconds per day. The NH35 has a rated accuracy between -20 to +40 seconds per day under normal conditions. Manufacturing Variations: Japan and Malaysia.Make sure to check out Tony’s blog halfpastthehour. Lumibrite is Seiko’s own variant of Super Luminova. The dial is matt black and features applied indices and Seiko’s magnificent Lumibrite fill on markers and hands.
This Seiko movement does not seem to be hand-finished, so no beveled edges but machine finishing. Although Seiko says it’s regulated to -10 and +15 seconds, most owners report a daily deviation of well within COSC specifications. Compared to caliber 9S55 this caliber 8元5 has an increased balance wheel. It’s rhodium-plated, has 26 jewels, beats at 28,800 vph (or 4 Hz), has 50 hours of power reserve, has a hacking function and has automatic winding. The movement is caliber 8元5, which is an undecorated and unadjusted version of the high-end Grand Seiko caliber 9S55. With a height of 14.6 mm and a diameter of 44 mm, and weighing 209 gr on the bracelet (136 gr on the rubber strap), the monocoque case still wears comfortable. The design is based on a more than 30-year old design, however everything is bigger and more robust compared to older (and most other) Seiko dive watches. Due to the superior seal this Seiko doesn’t need a helium/gas escape valve. Most dive watches designed for depths of 300 meters, like the Rolex Sea-Dweller or Omega Seamaster, are equipped with a helium/gas escape valve. This Seiko Marine Master 300 is reference number SBDX001. There is another Marine Master in the Prospex line, but that one has a depth rating of 600 meters and has a spring drive movement. This is no ordinary Seiko this Marine Master 300 is part of the ‘Prospex’ line of watches, Seiko’s upscale diver line that is only sold and marketed in Japan.
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