Grand Seiko SBGC003 Chronograph Dual Time Spring Drive Showcase Review

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Greetings! I'm Tim of Govberg and welcome to the world of Grand Seiko. Today I'll be your guide to the Grand Seiko SBGC003 Chronograph GMT Spring Drive. This 43.5 millimeter stainless steel timepiece features a combination of Grand Seiko's automatic winding spring drive caliber with a chronograph and a second time zone.

Now, as with all Grand Seiko products, the output of quite possibly the quintessential manufacture, this time piece is defined by it's caliber. In this case, automatic spring drive chronograph GMT caliber 9R86, which features two levels of refinement. The first you'll see as a chronograph, is the crenelated column wheel -- you can see its structure beneath my thumb. The watch also features a vertical clutch engagement, and this is a legacy of Grand Seiko chronograph engineering, dating back to the reference 6139 caliber of 1969. The first automatic chronograph caliber ever issued.

Moreover, the chronograph's logic is simple, easily laid out, logical, and accessible. With chronograph seconds at center and stacked registers for chronograph minutes superimposed above chronograph hours. Again, legibility at a glance. Now, the column wheel pairs with a vertical clutch such that you have the crisp audible and tactile response of the column wheel function selector with the smooth engagement courtesy of the vertical clutch. There's no jump of the second hand, nor is there stagger when you halt it, and it always resets precisely to the index at twelve. That's the benefit of a vertical clutch. Now, it's also worth noting that you get more than a refined chronograph; you get spring drive itself. A completely unique system that converts the kinetic energy of manual winding or the winding rotor into spring stored energy, into electrical energy, and back in to kinetic energy in the form of the chronograph and the civil time hands.

Now, it's important to not that while a conventional spring driven chronometer typically achieves accuracy around plus six minus four seconds per day, the chronometer standard, this spring drive caliber 9R86 is rated by Grand Seiko to no worse than plus 15 minus 15 seconds per month. Extraordinary by any standard. It also features a 72 hour power reserve, solidly more than the industry spring driven standard of 42.

And finally, Grand Seiko allows each watchmaker to assemble each spring drive caliber from start to finish. Entirely built and regulated by a watchmaker, it's the product of human hands and a master's eye. The watch features vast functionality, starting with its ability to tell time true, but also including the chronograph and a second time zone. And to that end, a 24 hour hand, you can see the visible red arrow superimposed over the seven o'clock index, makes one circuit of the dial every 24 hours of the day. It gives you am to pm distinction in a time zone where you are not, so you won't accidentally make a 4 am wake up call to friends, family, or business associates when you accidentally believe it to be 4 pm in the afternoon.

Moreover, the spring drive caliber features all standard refinements in this category of spring driven caliber, starting with hacking or stopped seconds. Now you can see how the second hand, both constant at 9 o' clock and chronograph has halted. Now you can precisely synchronize to a known accurate reference time. Moreover, there is an intermediate position where you can manipulate the local hour hand and you'll note the seconds hand as we as the chronograph continue to run.

The watch is endowed with 100 meter or 10 bar water resistance, which Grand Seiko rates as sufficient for most water-borne activities, short of outright professional diving. This hermeticity is endowed by unique and generously threaded shoulders to the screw-down pushers; far larger than conventional screw downs. They make it easier to manipulate the watch when your hands are gloved, wet, or sweaty. You'll also note that when you screw them down and enable the pushers, you enable the chronograph but you also reduce the water resistance. Grand Seiko gives you a visible cue: the black band about the shoulder of the pusher lets you know that it is vulnerable.

This watch is rugged. It's versatile. It has a combination of functions: long power reserve, chronograph, second time zone, that make it appropriate for almost any application. It has a potent combination of a black dial and a white metal case featuring optically smooth Grand Seiko mirrored Suratsu hand finishing, and a rich-grained satin finish atop the intermediate as well as outer shoulders of the bracelet paired with a rugged, single fold twin trigger Grand Seiko clasp. You need to push the triggers to release; it can't simply pop open, it is not friction fit. Hand made, hand finished. Entirely within Grand Seiko's Ateliers.

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