Here is a link to Naim serial numbers for each year.
Note that the current serial numbering scheme began in 1982. Prior to this the serial numbering was different and cannot be easily dated by serial number. Also, staff built items have either no serial number or a different numbering scheme.
Mu-So products have a different numbering scheme.
All Statement product is hand built to order, serial numbers are produced from a pre-selected range and do not correspond to the Classic sequential number system.