Part of Ordnance Survey, first series, issued 1813 - map:- British Library
The area within the broken lines was once a detached part of Steep, Hampshire. Absorbed into Sussex by the Act of 1844.
Further similar map shown below
similar map to above, dated 1808 - courtesy:- British Library
The area within the red broken lines was once a detached part of Steep, Hampshire. Absorbed into Sussex by the Act of 1844.