Watch List notes:

INDIAN COINS. Imperial Period. Victoria, Silver Proof ½-Rupee. 1849. no mint, .W.W, plain edge, 4.39g (KM 456.5; Pr 84). Impaired proof, buckled, rare.
The coin weighs only 4.39g yet there is no reason to suggest it is not original. Perhaps it is a trial striking.

Estimate: £80-120