Cassidy & Le Page (1967: 219) define han (s.v. HAND) as 'the arm: any part or all of the arm, including the hand'. They go further to point out that '[t]his usage is now less common than it once was'. It is likely that their comment regarding the reduced frequency of this sense of the word was prompted by their inability to find any illustrative quotations as support.
However, hand/arm identity is currently a pervasive feature of Jamaican Creole which suggests that Cassidy & Le Page may have underestimated the frequency of this phenomenon.