Do all Gucci belt serial numbers have 21 digits?

No, not all Gucci belt serial numbers have 21 digits. The serial numbers of authentic Gucci belts range from 19 to 21 digits. Nearly all of them begin with "114" or "223." Be wary of any belt that has a serial number that begins with "1212," as these digits are commonly used to start fake serial numbers on replicas. On 1stDibs, shop a selection of Gucci belts.