I have a Franck Mueller Crazy Hours watch that was given to me about 15 years ago. I have never worn it. However, it didn't come with a box or certificate. It was used. I am trying to determine if it is authentic or a fake and how much it might be worth.
normal watch dimensions
Franck Mueller - A Stainless Steel Crazy Hours Manual Wind Wristwatch, Swiss
the tonneau-shaped case with multi coloured Arabic numerals at random, manual movement, the reverse of case stamped "8580 Master of Complications No:98", on tapered grey leather strap, no box