The Tourbillon Mechanical Watch compensates for the gravity - induced gain or loss with its mobile carriage . The Tourbillon Mechanical Watch , whose carriage is mounted on one side only , with no supporting bar , allows better visibility through the cutout window at 6 oclock . The watchs face ( and back ) is made of sapphire glass , making it scratch - resistant . The Tourbillon Mechanical Watch is a limited edition .
According to the above context, answer the following question.
What may be the reason consumers will buy the watch immediately ?


The number of these timepieces is restricted .