SEIKO-Prospex Sea SUR605 black rubber strap lap/split times)

lap/split times)

revealing the El Primero 21 automatic movement with two escapements beating at 50Hz and 5Hz

Housed in a 37mm stainless steel case and paired with a green NATO textile strap

one of the world's first automatic chronographs

Case and bezel material

SEIKO-Prospex Sea SUR605 black rubber strap lap/split times)Caliber Number 6N01 Precision 15 seconds per month Battery life Approx. 3 years Case Band Case Material Stainless steel Case Size Thickness: 8. 9mm Diameter: 34. 0mm Lug to lug: 40. 8mm Crystal Curved sapphire crystal LumiBrite Lumibrite on hands and index(es) Clasp Three fold clasp with push button release Distance between lugs 16mm Other Details Water Resistance 20 bar Magnetic Resistance 4,800 A m Features Mother of pearl dial Screw case back