It's a ½ Anna, but I believe it's a forgery. It's similar to the first ½ Anna, SG 2, of 1872, but the whole appearance of the stamp is wrong, none of the SG 2 stamps was lettered 'EEGAM' instead of 'BEGAM, the paper looks wrong, the cancellation looks wrong, and I'm very doubtful about the embossing in the centre.
Here is a genuine sheet of SG 2:

And this is what the genuine cancellations of that period look like:
