Seiko Prospex SBDC221/SPB545 Diver 1965 Heritage Save the Ocean Limited Edition automatic watch 2025.12 releaseProduct Highlights Movement System: Automatic mechanical (manual winding optional) Movement Reference Number 6R55 Movement System Automatic mechanical (manual winding optional) Accuracy +25 seconds to 15 seconds per day Power Reserve Approximately 72 hours fully wound Jewels 24 Functions Stop seconds function Case Material Stainless steel Case Dimensions Thickness: 13. 0 mm Width 40. 0 mm Height 46. 4 mm Crystal Material Domed sapphire crystal Crystal