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If you reply with the and model (alto/tenor), I can give you a more precise date based on logged examples from repair archives.
The first step is to find the number. On the vast majority of modern saxophones, the serial number is engraved on the back of the instrument's body. Look along the main tube of the saxophone, just below the thumb rest. You may need to look closely, as the engraving can be small. hanson saxophone serial numbers
For many major saxophone brands like Selmer, Yamaha, and Yanagisawa, serial number lookups are readily available online or in published charts. However, this is not the case for Hanson. If you reply with the and model (alto/tenor),
Reach out to Hanson Instruments via their official UK workshop channel. They maintain internal factory build logs. Look along the main tube of the saxophone,
Unlike major vintage brands (like Selmer or Conn) that have exhaustive, publicly available charts, Hanson serial numbers are best understood in the context of their production timeline from 1989 to the present.