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Grand Seiko SBGC015 Spring Drive Chronograph GMT Functions & Care

1,684 views · Published 28 February 2017 · 5:53 · Indexed 8 November 2026

Channel: Govberg Jewelers · 2017 · Howto & Style

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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 SBGC015 Spring Drive Chronograph GMT, black ceramic, limited edition. It's important to note that this automatic winding watch can nevertheless be manually wound by taking the crown and threading it in a counterclockwise direction until you can feel it distinctly pop out of its threaded sleeve. Now it's in the first position for winding. Begin turning the crown approximately 30 turns will be sufficient to start the watch. Then at that point the crown can be threaded in and the natural course of kinetic energy on the wrist in conjunction with the case back winding rotor will continue to top off the power reserve and keep the watch functioning.

Should you desire to completely energize the approximately 72 power reserve for the spring drive caliber simply continue turning the crown in the clockwise direction 45-60 turns. You'll note when the reserve de marche indicator is maxed out, the watch is full. Also note you cannot accidentally overwind the watch as mechanical precautions have been taken against this accidental damage. It's also important to note that once the watch is operating there are other crown positions.

The first position out from winding, the second position overall moves the local hour hand. You'll note that the local hour hand is the time where you are, thus it is keyed to the date window. As you jump forward or backwards with the local hour hand think of it as a time zone feature for travelers. It does not stop the advance of the watch. The seconds continue to tick and the reference time zone with its red tip, and the minute hand, continue to advance so precision and isochronism are not affected.

However, when you pull the crown out to extremity, its outermost position, now we are three clicks out from screwed in, you can advance all of the indications of the dial in sync. You will note the stop seconds function present, because the constant seconds dial has halted. Now you can precisely synchronize to a known accurate reference time such as an atomic clock. Once the watch has been set and wound be sure to thread the crown back in to ensure physical security and water resistance.

The watch is also a chronograph, so it's important to note when you press the start pusher at 2 o'clock you must press it again to stop and then reset with the pusher at 4 o'clock. It's critical to always operate a chronograph in this sequence as attempting to reset while the chronograph is operating can severely damage the movement.

It's important to mention water resistance is the single greatest factor in maintaining the physical integrity of your watch both cosmetically and mechanically. Now this watch is rated to ten bar, or 100 meters, which Grand Seiko rates as sufficient for all water activities except professional diving. It's important to note first and foremost that leather is a porous natural material, so a leather strap is never water resistant. 

It's also important to note with respect to water resistance that you can help avoid accidental drowning. When a watch is submerged or there's water on the case forgo use of any of the pushers or crown functions as these can lead to bypassing of the seals and introduction of water into the interior of the watch. This is catastrophic both cosmetically and mechanically. In order to ensure that factory rated hermiticity is maintained take the watch to a Grand Seiko authorized service center minimally every 24 months to have a water test preformed quickly and easily.

With respect to subsidiary  hazard there are two primary ones. First, magnetism. Keep your watch remote from these to ensure its precision. With respect to shock, ensure the watch is not used during activities, these severe shocks can damage a fine automatic spring drive caliber. It's important to note that while the caliber itself is quite rugged these extreme sports can generate momentary g-shocks between 2,000 and 5,000 that are beyond the realm of any shock protection. Don't wear your watch during those activities.

Finally with respect to factory mechanical service Grand Seiko recommends overhauling the movement every three years. It's important that this be done exclusively with authorized service centers of Grand Seiko as only these agencies have the trained personnel, specialized equipment, and original factory replacement parts to preserve the value of your watch both as an investment as an instrument. Moreover, only these agencies are authorized to back all parts and work invested with a Grand Seiko factory service warranty.

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