Grand Seiko SBGA 231 - A Spring Drive Powered Diver’s Watch
This diver’s watch is powered by Grand Seiko’s unique Spring Drive caliber, which combines the motive force of a mainspring with the high precision of a quartz watch. The case and band are made with high-intensity titanium, providing a scratch and corrosion resistant finish with a 137g weight reduction, making it 30% lighter than stainless steel and a pleasure to wear. The watch is water resistant to a depth of 200 meters and utilizes Lumi Brite for increased visibility of the hands and index. Designed for use in some of the most unforgiving environments, the rotating bezel is removable for simple maintenance while the area around the crown has been crafted to ensure that residue from dirt, sand, or seawater can be easily washed off. With a mirror-finished case achieved through Zaratsu polishing, a lustrous rotating bezel, and multi-faceted cut indices, this watch is unmistakably Grand Seiko in its appearance, high specifications and durability.
By the way, as for long-term reliability of the Spring Drive movement, Seiko says that because the entire gear train rotates constantly without several stops every moment, because there is no traditional escapement with sensitive, lubricated sections, and the rotor wheel of the gear train rotates continuously, Spring Drive movements should last you a very long time. As for the electronic parts, because there are no chemical components (e.g., a battery) to deteriorate and the way the electronics work are comparable to quartz movements (which can last several decades), one should expect long life from a Spring Drive watch.
The ROLEX Submariner is no longer the king of the sport watches. The Grand Seiko SBGA231 Spring Drive diver watch in titanium is a better watch. The GS is more accurate, more comfortable on wrist, has better fit and finish and has a longer power reserve. Also, the Grand Seiko needs less service and the sweep second hand is amazing to watch. The more you wear the GS diver the more you notice the attention to detail that the in-house hand construction allows. The entire watch is hand-made by the folks at Grand Seiko. Extreme quality is the norm. Stop by and see the large selection of GS watches at http://littletreasury.com - If you do, like me, you will leave with a new Grand Seiko on your wrist!
Many have asked why Seiko uses pins and friction collars or what they refer to as pins and pipes to hold links together in many of their high-end bracelets. This system allows for better movement of the bracelet in use and less wear on the links. Also, when compared to friction pins hold up better used over and over again. When compared to screws the pins and pipes are less likely to come lose when properly installed.
Grand Seiko SBGA231 stats:
Case : High-intensity titanium Case back: Solid titanium
Glass : Sapphire crystal
Coating : Anti-reflection coating on inner surface
Lumi Brite : Hand and index
Case size : Diameter 44.2mm × Thickness 14.0mm
Movement : Caliber 9R65
Driving system : Spring Drive
Power reserve : Approximately 72 hours
Accuracy : ±1 per day (±15 seconds per month)
Clasp : Three-fold clasp with push button release
Water resistance : Water resistance for air diving 200m
Magnetic resistance : 4800 A/m (60 gauss)
Weight : 137.0 g
Screw down crown
Power reserve display function
The ROLEX Submariner is no longer the king of the sport watches. The Grand Seiko SBGA231 Spring Drive diver watch in titanium is a better watch. The GS is more accurate, more comfortable on wrist, has better fit and finish and has a longer power reserve. The thermal properties of the titanium as well as the light weight (about 137 grams) make this watch exceptionally comfortable on wrist in all temperature conditions.
Also, the Grand Seiko needs less service and the sweep second hand is amazing to watch. The more you wear the GS diver the more you notice the attention to detail that the in-house hand construction allows. The entire watch is hand-made by the folks at Grand Seiko. Extreme quality is the norm. Stop by and see the large selection of GS watches at http://littletreasury.com - If you do, like me, you will leave with a new Grand Seiko on your wrist!
About the titanium used by GS: Is a Seiko proprietary alloy which is claimed to be 1.5 times harder than 316L stainless steel. Bright Titanium is used in the GS SBGA011 "Snowflake", SBGA031 200m diver, SBGC005 Spring Drive GMT chronograph, SBGE015 Spring Drive GMT and other models within the Seiko portfolio of premium brands.
As I have been told my YSERV, Bright Titanium (aka "High intensity titanium") does not have any special surface coatings or additional treatments. Its scratch resistance is about 300-350 in the Vicker's scale. Compare that to 316L stainless steel (180-200) and pure titanium (Around 100).
The intent of the alloy is three fold:
To give the watch the sheen and look of a stainless steel finished piece, thus avoiding the "dull" and "plasticky" look often associated with pure titanium watches.
To give the watch increased wear resistance properties. Titanium is far stronger than stainless steel, has superior corrosion properties, is hypoallergenic, has about 50% the total density of stainless steel and it is more durable. However, titanium in its "pure" form is softer and tends to scratch much easier than steel.
To allow the metal to be refinished when the watch is sent into service. The presence of surface treatments and coatings (Like DiaShield or Citizen's Duratect) make the refinishing process more difficult, although, these coatings provide essentially higher wear resistance properties.
Bright Titanium is not to be confused with Seiko's DiaShield surface treatment which is a special surface coating applied to pure titanium and it is available in a very limited selection of affordable Seiko watches. DiaShield has surface wear resistance in the 500-600 range in the Vicker's scale. Citizen's Duratect is even better with surface wear resistance measured in the 800-1200 region in the Vicker's scale..
Stainless steel watches, have in my opinion, the edge in the overall looks department and the metal is easiest to restore. While Bright Titanium is close in terms of the "sheen" and appearance of stainless steel, is not in equal terms and it is not a substitute either.
One aspect that I don't like too much about titanium watches in general (Be it pure titanium, coated or Bright Titanium alloy) is the propensity of the surfaces to show finger prints and smudges. It is hard to keep a titanium watch free from these agents in comparison to a steel counterpart.
Bright Titanium has the advantage of preserving some of the look and feel of steel in a lighter package with all the inherited advantages of titanium. It can also be refinished, hence why Bright Titanium is offered in the Grand Seiko range but you will never find Grand Seikos or Credors with DiaShield, because the coating makes repairs more difficult (Egg shell effect if the coating is dinged up or severely damaged).
I think that Titanium treated surfaces are a double edged sword. They do provide effective daily wear protection but if severe damage is done to the surface, thus breaking the coating, repair will be difficult if not impossible.
The SBGA029G is the stainless steel version.
The SBGA031 is the older titanium model with SEIKO on the top of the face. The Grand Seiko Quartz Diver are models: SBGX115 SBGX117
From another Spring Drive owner - Re: Grand Seiko Diver - Quartz or Spring Drive
I have a spring drive chrono and I don't plan on maintaining it until it actually has a problem. I'll take my chances. In my experience with all kinds of products the product is never the same after they crack the original seal with any manufacturer warrantees or service. I had Seiko fix a watch under warranty that was 10 bar rated and it ended up taking on water. They had to give me a new one. I've had new cars that when I took them in for warranty at the original dealer; more than once it came back with new problems. I like having the factory seal on my SD. At this point it's un-contaminated.
I honestly don't feel comfortable having the seal broken for any reason; not a battery, service or warranty. I'll take my chances with the original assembly and seal. I believe the watch is the best it'll ever be mechanically. Every time you open it you invite unintended potential problems.
Discussing what might go wrong if I don't maintain it; what could go wrong? At 10 bar rated pressure seal, the oil won't be going anywhere. As far as wear, it is minimal. The gear train on the SD only moves in one direction. This reduces wear significantly. But even if over a very long period of time it does experience wear then it'll probably start to run a little faster. This wouldn't or shouldn't be a problem because the SD electromagnetic braking system will slow it down to match the quartz timing mechanism inside so that it still maintains a 1 minute a year accuracy. Lets say I get 35 years out of it before I have to service it. So what? I avoided 6 service intervals at savings of about $4800 dollars. I'll just buy a used one from someone that did maintain it or I'll spend $1500 to fix whatever happened to it and go another 35 years.
I've heard, but not sure if this is true, that some watch collectors of old watches actually prize an old watch with an original factory seal; don't know if it is true or not. As far as durability, you may want to watch this video of the testing that Seiko went through with Cal Poly State University to see if the SD would hold up in space before they produced the Spacewalk Spring Drive. It's pretty impressive.
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