"unless stamped with provable original numbers" ,,,,,,,,,, and thats why people want the correct stamps ie size font , you know that there are numbers issued by norton and no machines exist with these numbers on today . a dateing cert off any of these clubs goes by these numbers and some times an inspection (but some times just a rubbing) with this slip of dispatch records and the letter headed paper from the club you are away . its the stamping with correct font and size which is the hard part the rest is plain sailing (im told)