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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →The Grand Seiko SBGM245 and SBGM247 share the same core specifications; the clearest difference is their dial and GMT-hand color. The SBGM245 pairs a deep blue dial with a red GMT hand, while the SBGM247 combines a subdued green dial with an orange GMT hand. Both are Sport Collection automatic GMT watches powered by Caliber 9S66.
What is the difference between the SBGM245 and SBGM247?
On the official specifications available for these models, the key distinction is visual rather than mechanical. Grand Seiko describes both watches as designed for legibility, with a distinctive color for the GMT hand. The SBGM245 has a deep blue dial and red GMT hand; the SBGM247 has a subdued green dial and orange GMT hand. See Grand Seiko’s Sport Collection information and its SBGM245 product page.
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| Specification | SBGM245 | SBGM247 |
|---|---|---|
| Dial and GMT hand | Deep blue dial; red GMT hand | Subdued green dial; orange GMT hand |
| Collection and case material | Sport Collection; stainless steel | Sport Collection; stainless steel |
| Movement | Caliber 9S66; automatic with manual winding | Caliber 9S66; automatic with manual winding |
| Case diameter × length × thickness | 40.5 × 48.6 × 14.4 mm | 40.5 × 48.6 × 14.4 mm |
| Band width | 20 mm | 20 mm |
| Power reserve | Approximately 72 hours | Approximately 72 hours |
| Water resistance | 20 bar | 20 bar |
| Weight | 180 g, per Grand Seiko Japan | 180 g, per Grand Seiko Japan |
The listed dimensions and weight come from Grand Seiko’s regional product pages: SBGM245 on Grand Seiko Boutique Online Japan and SBGM247 on Grand Seiko Japan. The reviewed pages do not establish a launch or first-sale date, so “new” should not be read here as a verified release-date claim.
How does the GMT function work?
Caliber 9S66 includes a 24-hour hand for displaying a second time zone. Its calendar-linked time-difference adjustment lets the local hour hand move without stopping the minutes or seconds, so the watch can be adjusted for a time-zone change while those indications continue. Grand Seiko describes this function on its Caliber 9S66 movement page and the SBGM247 product page.
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- See-through case back
- Date display
- Screw-down crown
- 40mm Diameter
- Weight 178.0 g
The movement specifications also list 35 jewels, a frequency of 28,800 vibrations per hour (4 Hz), a date display, and hacking seconds. Those features are shared by both watches because they use the same caliber.
What are their stated accuracy and power reserve?
Grand Seiko lists an approximately 72-hour power reserve for Caliber 9S66. It gives a mean daily rate of +5 to -3 seconds per day under controlled testing of the uncased movement in six positions. That figure describes the manufacturer’s test conditions, not a guaranteed daily result on an individual wrist. The same movement page lists normal-use accuracy as +10 to -1 seconds per day and notes that actual wearing results can vary with conditions.
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- Three-fold clasp with push button release
- Dual-curved sapphire crystal
- Power reserve display on the back
- Power resrve Approx. 72 hours(3 days)
How do the case and water-resistance specifications compare?
Both watches have a 40.5 mm case diameter, 48.6 mm length, 14.4 mm thickness, and 20 mm band width. Grand Seiko lists stainless steel, screw-down crowns, screw backs, and 20 bar water resistance for the models. These are published specifications, not independent test results.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How much do the SBGM245 and SBGM247 cost?
Prices vary by market and may change. As listed on official Grand Seiko pages accessed October 7, 2026, each model is USD 6,100 in the US and ¥792,000 including tax in Japan.
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- 24-hour hand (dual time display function)
- Power Reserve Approx. 55 hours
- See-through case back
For context, Grand Seiko’s US price-adjustment notice dated October 31, 2024 set a USD 5,800 MSRP effective November 1, 2024. That historical figure has since been superseded by the higher USD 6,100 listing on the current US pages. Check the relevant local listing for the latest price and availability.
Which one should you choose?
Choose based on the color combination you prefer and how the 40.5 mm case and 14.4 mm thickness suit your wrist. The SBGM245’s blue-and-red contrast and the SBGM247’s green-and-orange combination distinguish them visually; the official specifications reviewed do not show a corresponding difference in movement or core functionality.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
