With the 6542, we see https://www.ctlines.co.uk/Collection/cartier/ that gold examples have https://www.xzegarki.pl/kategoria-produktu/bremont/ been part of the mix from the early days of https://www.modexx.co.uk/product-category/cartier/ the GMT-Master, making it the first of Rolex's sport watches to be made in gold (though there were certain pre-Daytona chronographs made in gold). The literally high-flying world of international commercial aviation was better suited to precious-metal tool watches than the SCUBA environment that gave rise to the Rolex Submariner just a couple of years earlier, it seems.