model Grand Seiko
Heritage Collection Spring Drive
Model number (Ref.) SBGA437
Case material stainless
Dial color Silver ("Thick silver radiation" dial)
Case size Width 40mm x Thickness 12.3mm
Movement Spring Drive Cal.9R65
Drive time Lasts up to 72 hours (about 3 days) when hoisting
accuracy Average monthly difference ± 15 seconds (equivalent to daily difference ± 1 second)
waterproof Enhanced waterproof for daily life (10 bar)
Screw lock type crown
With calendar (date) function
30 stones
Second hand stop function
Power reserve display function
Back lid with lion coat of arms
Screw back (There are individual differences in the orientation of the back lid due to manufacturing reasons)