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 Indian Mountaineering dated 15-5-73 and  stamp of Indian Mountaineering Foundation issued on 27-8-83 are combined on one cover of 15-5-73 with cancellations of respective dates.