Seiko Digital Quartz Watch Rotocall Review SBJG023 Seiko Seiko Digital Watches SMGG17, SMGG19, SMGG21 Rotocall Reissue Review. Product Description The Seiko SBJG023 Selection Digital Quartz Watch is a limited edition collaboration model inspired by the popular Japanese series Space Brothers. Designed as part of Seikos Selection S Series, this watch combines a sporty digital layout with practical multi function performance. Powered by Seikos Caliber A824 battery powered quartz movement, it delivers stable accuracy with an average monthly deviation of 20 seconds. The digital display supports dual time, stopwatch, alarm, and timer functions, making it suitable for everyday wear as well as travel and active use. Key Features Limited edition Space Brothers collaboration model Digital quartz movement (Caliber A824) Dual time display Stopwatch with 1 100 second measurement (up to 99h 59m 59s) Alarm and timer (up to 100 minutes) Full auto calendar (valid through December 31, 2074) LED backlight Low battery warning function Specifications Movement Type: Battery powered quartz Accuracy: 20 seconds per month Battery life: Approx. 3 years Case & Band Case material: Stainless steel Glass: Hardlex Case size: Thickness: 10. 6 mm Width: 37. 0 mm Height: 43. 5 mm Clasp: One push three fold clasp Maximum wrist size: 195 mm Weight: 109 g