I received this too. But strangely, this was received on my bank account which was already unlinked to my demat account a few months ago.
So, I guess, it is arrears for some old interest, as there may have been some small calculation mistake on their end. This would be my guess.
Yeah, I have got some small denominations for couple of SGB tranches too. I am hoping some communication will follow to explain what that is.
Damn, just 2.25. I got Rs 210 something. Hopefully, in line with what I am entitled. 
This is interest for period between āapplication date to allotment dateā at 2.5% ā¦ Approx 7 to 10 days of interest.
Whatever i got before seems to be something else, any how as per the interest date of SGB today got correct ammount creditedā¦