Seiko Prospex SPB243 DY Collection_Chatelaine Reference SBGJ239 features a GMT

Reference SBGJ239 features a GMT hand

The surrounding diamond halo adds extra sparkle and glamour

glides across the dial

The automatic-winding NORQAIN caliber NN09 inside is visible through the sapphire glass caseback

Running on Grand Seiko’s unique Spring Drive caliber

Seiko Prospex SPB243 DY Collection_Chatelaine Reference SBGJ239 features a GMTRoyal Jewelers is an authorized Seiko dealer in the Boston area and offers the Seiko Prospex with Seiko's 3 year warranty. Movement Caliber Number 6R35 Movement Type Automatic with manual winding Precision +25 to 15 seconds per day Power reserve Approx. 70 hours Jewels 24 Functions Stop second hand function Date display Case Band Case Material Stainless steel Case Size Thickness: 12. 9mm Diameter: 38. 0mm Lug to lug: 46. 2mm Crystal Curved sapphire