Does a walker whiskey bottle dated1798 have any value?

A bottle of Walker whiskey dated 1798 is extremely unlikely to be genuine.

The earliest existing bottle of Scotch whisky was produced around the 1820s, and the first recorded use of the Walker name in whisky production was in 1837 when Johnnie Walker was launched.

Therefore, a bottle dated 1798 would be highly unusual, potentially even fraudulent.