The half anna vermilion stamp was never issued. Red ink from London was not to be had and local alternatives were unreliable. But an initial supply of 900 sheets did sail for Mumbai from Kolkata on 5 April 1854. Once the new die, in a new colour was prepared, Mumbai was wired to destroy the red stamps. This block probably survived by having already been sent to an up-country post office.
1854 The half anna vermilion stamp, compared with half anna blue as issued
Die I, in blue. The most frequently seen die. This value was released 1 October 1854