Grand Seiko SBGC003 Spring Drive Chronograph Dual Time Functions & Care

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Greetings, and welcome to the world of Grand Seiko. Today I'll be your guide to the proper usage, care and maintenance of your Grand Seiko SBGC003 Spring Drive Chronograph GMT. This automatic winding watch can nevertheless be manually wound should it run down, by threading the crown counter clockwise. Once it's out of it's threaded sleeve, you'll feel a distinct pop into the first position, and now the crown can be turned in a clockwise direction, and you'll note the reserve de marche indicator on the dial, will progress from empty to full.

Approximately 30 turns will be more than sufficient to begin the operation of the movement at which point kinetic energy absorbed from the wrist and the winding rotor on the case back will continue to top off the watch's power reserve such that it continues operating. Over the course of three to four conventional days will fully energize the power reserve. However, should you wish to fully energize the power reserve by manual winding, simply continue turning 45 to 60 turns in the clockwise direction. You can not accidentally overwind this timepiece. Once the watch has been wound and fully energized, now the setting functions can be utilized. There is one position out from the case that is the position for setting the local hour hand. This is a GMT or dual timezone watch, so the local hour hand is the time where you are, thus it is keyed to the date, and the date will advance in sync with the local hour hand.

Note that as I'm manipulating the local hour hand backward or forward, representing travel through multiple timezones, you'll see that the movement continues to operate. The seconds hand continues to advance and the timing of the reference timezone which has a red arrow, as well as the minutes displayed on the dial are not affected. The isochronism of the watch, as well as the timekeeping are not affected by a change in the local time, however when you pull the crown to it's outermost position, now you hack the movement, you stop the seconds. All of the indications on the dial move in sync with the reference timezone being a 24 hour hand, it moves in one circuit of the dial per day.

Once the time is set, return the crown in to it's first position and thread it to a halt against the flank of the case, for physical security and water resistance. The watch is a Chronograph which means the Chronograph Pushers feature their own threaded sleeves. You'll note, when they're secured they actually thread out and they cover a black band on the lateral portion of the Chronograph Pushers. You know that the Chronograph is enabled when the black lateral band is visible. Of course a Chronograph must always be operated in proper sequence. Beginning with the start from the Pusher at two o'clock. Commencing with the stop, and then reset by the pusher at four o'clock. Start, stop, and reset. Always utilize the functions of the watch in precisely that order, as attempting to reset the Chronograph while it is running can severely damage the timepiece.

Other hazards that are worth mentioning and significant in the context of a fine watch include magnetism which can alter the timing of the watch adversely, and shock which can physically damage the movement. Avoid both.

It's also important to note that with respect to water resistance, the timepiece is rated to 10 bar, or 100 meters which is sufficient for most water born sports short of professional diving. However, you must work with your watch to avoid accidental drowning. Ensure that the crowns are always threaded in completely before you take the watch into the water. It's also important to note that you should never utilize any of the functions, nor screw the crowns out while the watch is submerged or while there is water on the case as this can bypass the seals. Furthermore it's important to note that with respect to water resistance, it is not a static feature of the timepiece and overtime, as seals age and lubricants dry, water resistance will ebb so Grand Seiko recommends at least every 24 months having your watch water tested with an authorized service center to ensure that the factory rated hermiticity is retained.

Now finally with respect to comprehensive mechanical service of a fine watch, Grand Seiko recommends a factory overhaul at least once every three years. Now this should be performed exclusively with an authorized service center of Grand Seiko as these centers have the trained personnel, the specialized equipment, and the exclusive Grand Seiko factory replacement parts to maintain the value of your watch as both an instrument and as an investment.