The only official limited edition Rolex ever made public, the ground-breaking 'Beta 21' powered 5100 Oyster Quartz... The unique (numbered edition) 18ct yellow gold case is unlike anything else that ever left the Geneva workshop, and was the very first Rolex ever fitted with a sapphire crystal glass. Only around 750 pieces were produced in 18ct yellow gold and to find one in such crisp (and fully working) condition today is a genuinely rare thing. One of the crispest examples we've ever seen, you know it's going to be good when Rolex and Patek collaborate on a limited edition!