This is an Il Bisonte wristwatch. I purchased it at a department store. The leather part is quite worn. The watch itself has stopped, but the face is clean, so I think it will work if you replace the battery. I've replaced the battery several times, and I think the last time was two years ago. The diameter is about 3.5 centimeters, and I think it's unisex. By the way, the first photo shows how it looks when worn by a woman.