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SRP731K1

SEIKO 5 SRP731 Automatic Watch

The Seiko SRP731 is a 45mm men's automatic watch with a stainless steel case and a blue analog dial protected by hardlex crystal. It uses a 4R36 caliber self-winding mechanical movement that can be manually wound and hacked (the second hand stops when the crown is pulled out). It ticks 6 times per second which gives the second hand a smoother movement than a quartz watch which ticks once per second. The watch should run for up to 41 hours when fully wound and will self-wind when moved.

Specifications
Model nr. SRP731K1
Brand Seiko
Gender Men's
Movement
Type Automatic
Caliber 4R36
Beats per Hour 21,600 bph (6 bps)
Manual Winding Yes
Hacking Yes
Power Reserve 41 Hours
Instructions Owner's Manual
Case
Crown Position 03:00
Case Width (mm) 45
Case Thickness (mm) 13
Case Shape Round
Case Material Stainless Steel
Crystal Material Hardlex
Water Resistance (meters) 100
Screw Down Crown No
Second Crown No
Complications
Moonphase No
Day Window Yes
Date Window Yes
Time Types Hours, Minutes, Seconds
Band
Band Material Stainless Steel
Band Color Silver
Replaceable Band Yes
Band Width (mm) 22
Dial
Dial Color Blue
Hour Markings Bars
Bezel
Bezel Function Unidirectional
Bezel Material Stainless Steel
Bezel Color Black, Blue