Some believe the Rolex Explorer I BLACKOUT to be the rarest sapphire crystal Rolex. The very first version of the Rolex Explorer I reference 14270 released in 1990 is called the BLACKOUT. The glossy black dial has 3,6,9 numbers which are filled in with black enamel. Rolex only made the reference 14270 this way for approximately 1 plus years. You will only find BLACKOUT Explorers with E or X serial numbers. This particular watch has an X serial number. The condition of this piece is outstanding with original hang tags and papers.