As far back as the 1990s, Tannoy loudspeakers have been brandished with a 20 digit serial barcode label. You can find this on any of our speaker cabinets from this time onwards, usually on the back.  If your speakers do not have this label because the speakers date back to before the 90s or a previous owner has removed it, please submit a query and we can help to identify them and prove authenticity.