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Wednesday 1st December WRUW?

Jet Jetski

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Seiko Blue Wave Sawtooth SHC057.

Cal. 7N36, quartz movement with a 4 year battery life. Case no: 7N36-0AF0, the serial no. dates this one to 2013, and this is borne out by the battery replacement reminder on the case back. As these watches have a 4 year battery life, you will notice a small dot at the 4th quarter of the 2017 mark which was done when the watch was first issued, as a reminder to replace the battery, the code for which is also displayed. (SR920SW = 370/371). The watchmaker/collector who replaces it, is supposed to make a new mark next to the appropriate year, but the German collector I sourced it from said that although he changed the battery before selling, he didn't want to make any more marks on the watch. Case is 47mm across and 12mm thick, with a domed Hardlex crystal. The bracelet links are a combination of brushed and polished, with solid, 20mm end links, and there is a diver’s wet suit extension in the clasp. The case design is unusual in that the four finely knurled Allen screws actually hold the real case within the outer 'Tuna' style shroud. The screw down crown is finely knurled and matches the four Allen screws. The lume is Seiko's usual 'Lumibrite' and on this model seems very bright indeed. The watch was available with several dial variants, namely black, orange, blue wave and carbon fibre. The orange version had a black bezel, and most models were available with either a rubber strap, or the bracelet.


Seiko Sawtooth

Seiko Sawtooth

Blue and orange versions together.

Seiko Sawtooth

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