<P> On 1 April 2007 to commemorate the 150th anniversary of the 1st postage stamp of Sri Lanka a souvenir sheet was issued in both perforate and imperforate types . </P> <P> All the souvenir sheets issued so far were rectangular in shape . The first irregular shape souvenir sheet was issued on 22 May 2001 on' Seashells of Sri Lanka' for the World Biodiversity Day . The sheet was in the shape of a seashell . </P> <P> Now, Sri Lanka issues several souvenir sheets annually . A souvenir sheet is almost always issued with Wesak and Christmas stamps . Sometimes, choosing one stamp from a set of stamps, a small miniature sheet, containing that single stamp is issued . Because they are attractive, they have become favourites among collectors . </P>

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