Grand Seiko Heritage
Exterior:
18K yellow gold Case back:
18K yellow gold + sapphire glass
Case back specifications:
Screw-on, see-through case back
Glass material:
Dual curved sapphire
Coating:
Anti-reflective coating on the inside
Case size:
Width 39.0mm, height 46.8mm, thickness 12.5mm
Clasp:
Three-fold type
Movement:
Spring drive automatic winding (with manual winding)