Seiko 5 Sports GMT Automatic “Joker” Edition SBSC021

The Seiko 5 Sports GMT Automatic “Joker” Edition SBSC021 is a distinctive Japan-exclusive timepiece that combines Seiko’s iconic SKX-inspired sports design with practical GMT functionality. Featuring a striking black dial, purple-and-blue 24-hour rotating bezel, and vibrant red GMT hand, this model offers a bold look for collectors and everyday watch enthusiasts.

Powered by Seiko’s 4R34 automatic GMT movement, the SBSC021 displays a second time zone through its 24-hour GMT hand and includes a date function, manual winding, and stop-seconds functionality. The stainless-steel case and bracelet provide a durable, versatile construction, while the Hardlex crystal with lens, LumiBrite hands and indexes, and 10-bar water resistance make it suitable for everyday wear.

The watch measures 42.5mm in diameter and 13.6mm thick, with a transparent screw-down case back that allows a view of the mechanical movement. With its Japanese-inspired purple and blue bezel colors and Made-in-Japan construction, the Seiko 5 Sports GMT SBSC021 stands out as a unique addition to any Seiko collection.

Key Features

• Brand: Seiko
• Collection: Seiko 5 Sports SKX Series
• Reference: SBSC021
• Popular Nickname: “Joker” GMT
• Movement: Seiko Caliber 4R34 Automatic GMT
• Movement: Automatic with manual winding
• Power Reserve: Approximately 41 hours
• Jewels: 24
• GMT Function: 24-hour hand for dual-time display
• Date Display: Yes
• Stop-Seconds Function: Yes
• Case Material: Stainless steel
• Case Diameter: 42.5mm
• Case Thickness: 13.6mm
• Lug-to-Lug: 46.0mm
• Dial Color: Black
• Bezel: Purple and blue rotating 24-hour bezel
• Crystal: Hardlex with lens
• LumiBrite: Hands and indexes
• Bracelet: Stainless steel
• Water Resistance: 10 bar / 100 meters
• Case Back: See-through screw-down case back
• Clasp: One-push three-fold clasp with double locking
• Weight: Approximately 161g
• Country of Manufacture: Japan