Look at the neck. Authentic Hanson saxophones often have the model stamped on the neck receiver (e.g., "Hanson" and the model code). Counterfeits or "stencil" horns pretending to be Hansons often have generic necks or mismatched logos.
As a UK manufacturer, Hanson provides a "buy-back" policy and free servicing, meaning they maintain internal records. How to Identify Your Hanson Saxophone Often labeled with "HA5" prefixes. Series VIII: Labeled with "HA8" prefixes. LX Series: hanson saxophone serial numbers
: These represent the most recent, high-end bespoke production lines. Manufacturing Signatures Look at the neck