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16570 vs 16550

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Specification

Rolex

16570

Explorer II

Rolex

16550

Explorer II

Production1989–20111985–1989
Era40mm modernSapphire transition
Statusdiscontinueddiscontinued
Case diameter40mm40mm
Lug width20mm20mm
Case materialStainless steelStainless steel
BezelFixed 24-hour, engraved steelFixed 24-hour, engraved steel
Bezel materialStainless steelStainless steel
CrystalSapphireSapphire
CrownTwinlock screw-downTwinlock screw-down
Caseback typeSolid screw-down steelSolid screw-down steel
Water resistance100m100m
DialWhite (Polar) or blackWhite (Polar) or black
Dial configuration3-6-9 with white-gold-surround markers; independent orange 24h hand3-6-9 with white-gold-surround markers; independent orange 24h hand
HandsMercedes + independent orange 24hMercedes + independent orange 24h
LumeTritium then LumiNova / Super-LumiNovaTritium
Lume typeTritium / LumiNovaTritium
MovementAutomaticAutomatic
Caliber3185 / 31863085
ManufacturerRolexRolex
Windingautomaticautomatic
Power reserve~50 hours~48 hours
Frequency28,800 vph28,800 vph
Jewels3127
FunctionsHours, minutes, seconds, date, independent 24hHours, minutes, seconds, date, independent 24h
BraceletOysterOyster
Bracelet materialStainless steelStainless steel
Bracelet reference78790A78360
End links501B (hollow, later solid)580

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