India Post has issued different stamps on same or similar subject on different Occasions and Events. The collectors with creativity have made covers with combination of  stamps of such similar Occasions and Events duly cancelled on respective dates. Such covers show the creative efforts of the philatelists.

Here on this official cover, stamp of Bhakra Dam dated 15-12-1988 and stamp of Bhakra Dam issued on 22-10-2013 are combined on one cover of 15-12-1988 with cancellations of respective dates. Combination is of two events showing two stamps with pictures of Dam.