The Marinemaster is a long time favorite here at WG.
Simply put is probably the best diver in it's price range and probably up to 3x it's price.Simple, purposeful, well design, extremely well built and reliable.
The SLA021 is the replacement of the SBDX017 which in turn replaced the original SBDX001. The biggest difference to this new "generation" if we can call it that, is that this new SLA021J1 comes with a sapphire crystal and a ceramic lunette, or bezel insert as is more commonly known.
So, important and significant upgrades as these upgrades greatly increase it's quality. The rest remains basically the same, which is a good thing. The case consists of two parts, the case and the bezel, so everything has to come in (and go out) via the crystal. The Seiko Marinemaster 300 SLA021J 1 uses the same monobloc construction as the previous references, which is ensuring water resistance and makes a helium valve (if you’d need one anyway) redundant. On the case back, there’s the ‘Big Wave’, or ‘tsunami’ logo in bas relief as well as some engraving with regards to the reference number, serial number, water resistance etc. If you aren’t already aware of this, the serial number also indicates the year and month in which this watch was produced.
The movement is Seiko’s caliber 8L35 movement, based on the Grand Seiko 9S55 with a power reserve of about 50 hours. J
ust like its more expensive Prospex LX brothers, the case of the Marinemaster 300 SLA021J1 is also finished using the Zaratsu polishing technique. Won't bother you much about the details of this technique just want to say that the effect of the Zaratsu polishing and the brushed surfaces is stunning. It is just beautifully done and it is something of which you will never get enough. The Marinemaster 300 is also protected with a super-hard coating. Seiko refers to this as their ‘DiaShield’ treatment. So scratching the surfaces should not be very easy.
A lot of you are very focused on the luminosity of hands and hour markers, and with Seiko, you know this is nothing to worry about. Seiko uses their own Lumibrite composition, during low light conditions, or in the complete dark even, you will have no troubles reading the time on this Marinemaster.
This versions also has some very discreet gold details like in the "300 M" inscription on the dial and also the seconds hand, really nice details.
As in good old Seiko fashion this new SLA021J1 is not very different from it's predecessors, just a few good much appreciated upgrades and some subtle details.
Still is one of the best divers ever, just turned a little bit better.
This watch is in mint condition with almost no signs of wear and comes as a full set.