. Very rare. S.G. 39a (single). Photo" /> cover 1a. brown imperforate with good to large margins (½mm - 1mm), chamfered upper left corner and very minor creases at upper and lower right corners, on 1857 (August) envelope from Calcutta to Bangalore, tied by handstamp and manuscript<I> "Stamped"</I>. Very rare. S.G. 39a (single). Photo | Christie's