Seiko Prospex SPB505 Alpinist Mechanical Land Automatic 3 Days Black Dial

Movement: Automatic

Calibre: 6R55

Movement Description:  Automatic with manual winding, +25 to -15 sec/day,

Power Reserve: 72-hour 

Jewels: 24 jewels

Case Diameter: 39.5mm

Case Length: 46.4mm

Case Height: 12.7mm

Case Material: Stainless steel (super hard coating)

Crystal: Sapphire crystal with magnifier, inner anti-reflective coating

Dial & Hands: LumiBrite on hands and indexes

Strap/Band: Three-fold clasp with push-button release, 20mm lug width

Water Resistance: 20 bar

Magnetic Resistance: 4,800 A/m

Weight: 147g

Bezel: Rotating compass bezel

Crown: Screw-down crown

Case Back: See-through screw case back