On eBay, put up for sale the clock calculator, developed by HP in 1977. According to the seller, these watches are the prototype of the first watches with a calculator function, called HP-01, which went on sale 37 years ago, and then cost $ 600. This prototype is labeled 1A-007 has not been introduced in the market. Today's watches price on eBay is 14 500 dollars. Watch in stainless steel weigh about 150 grams and has 28 buttons that will help even the most complex calculations. The strap is made of metal links can be easily adjusted to fit your wrist.
At the time of release, in 1977, HP-01 made an incredible experience, because it was the first watch-calculator shown on the consumer market. Today, after almost 40 years after its release, it is very difficult to find running instances HP-01. Those who are interested for hours, still can buy them on eBay .