Well, there's probably lots of gold in Ft. Knox...it just doesn't belong to the United States any more! And there's more gold stored in the Federal Reserve vaults under Wall Street in New York than in Ft. Knox; again, most of it belongs to other countries...we're just providing a secure storage facility (reputedly, a large quantity of bullion is also held by the Bank of England). The U.S. went off the Gold Standard as a means of establishing and maintaining the value of its' currency in 1933 (and the rest of the world followed suit, of course)...worst economic move, ever! You have to remember that the VALUE of gold never changes (no matter what form it is in...coins, bars, jewelry...all the same); that is why it is called a "standard of value". What changes is the PRICE...all that is, is a measure of the value of the currency that is buying it. Gold was US$423/ozT the day I bought all the watches, now gold is US$1608/ozT. so it takes 3.801 times as many dollars to buy the same weight of gold; that tells me the dollar has lost 73.7% of its' value in less than nine years...
Anyway, the great majority of the watches were 18K simply because in Europe, and especially in the Middle East, 18K is the minimum standard for gold jewelry (you'll find bracelets and necklaces in 22K or even 24K gold, but for watch cases, 18K is as high as it can go without becoming too soft to be durable). If you want a noble-metal watch case, the best choice is platinum; it has almost the same mechanical properties as mild steel...18K gold is more like brass (one of the 18K P3s actually had a dent in the case, probably from being dropped on a hardwood floor...there were no scratches, just a dent; fortunately, I was able to push the metal out from the inside, rather like taking a dent out of a car door, then re-contour and re-brush the case, leaving no trace of the damage).
Of course, every one of the Pulsars was in one of the rare, two-tone suede-leather Gold Boxes; they were removed from them to save space in the vault. It is a source of endless disappointment to me that the boxes have not been found

.