The J-Class is named of the yacht specification used in racing.  Normally Breitling targeted pilots of planes, not boats, but there were a little ahead of the game here – Rolex didn’t launch their Yacht-Master until 1992.  Technically they are nothing like the Yacht Timers of old, with their countdown cut out discs, but no one was using those any more anyway.  The bezel on the J-Class is 18k gold, inlaid with green panels, and the crystal is sapphire.  The crown screws down.