The problem with determining year of manufacture by serial# is the basic premise that serial #'s mean only sequential production.
Many times that's not the case.
Any digit in a serial number could be designated for a production line or individual machine. A single digit could designate a supplier,, and on and on.
Serial numbers are for the manufactures classification only and can be completely random when trying to look at them as sequential.
A good example of what I mean is Harley engine and frame designations;
https://www.tabperformance.com/harley-davidson-vin-reference-guide-s/224.htm
Many times that's not the case.
Any digit in a serial number could be designated for a production line or individual machine. A single digit could designate a supplier,, and on and on.
Serial numbers are for the manufactures classification only and can be completely random when trying to look at them as sequential.
A good example of what I mean is Harley engine and frame designations;
https://www.tabperformance.com/harley-davidson-vin-reference-guide-s/224.htm
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