Sri Lanka is the only country to include details in a stamp in three languages viz. Sinhala, Tamil and English. The first stamps marked Sri Lanka were issued on 22 May 1972.

Souvenir sheets

Sri Lanka has been issuing souvenir sheets since 1966. Many of the earliest souvenir sheets issued by Sri Lanka are valuable. Sri Lanka issues souvenir sheets each year on many different themes.First souvenir sheet

The first souvenir sheet of Sri Lanka was issued on 5 February 1966 on the topic 'Typical Birds of Ceylon' and was imperforate. This sheet was reissued on 15 September 1967 to commemorate the 1st National Stamp Exhibition of Sri Lanka, overprinted 'FIRST NATIONAL STAMP EXHIBITION 1967'. Subsequently many souvenir sheets were issued, on many themes mostly perforated.

Other souvenir sheets

On 10 February 1981, a four stamp Surcharged souvenir sheet on 'Quadrupeds of Sri Lanka' was issued. The 4 stamps in the sheet were surcharged at the issue.

A practice of issuing souvenir sheets containing the Wesak stamps started from year 1981.

On 21 October 1981 a souvenir sheet was issued to mark the Sri Lankan visit of Queen Elizabeth and was the first souvenir sheet issued to mark the visit of a distinguished foreign head of state.

On 2 December 1982 a souvenir sheet was issued to commemorate the 125th anniversary of the 1st postage Stamp of Sri Lanka. This was the 1st souvenir sheet of 2 stamps of different denominations; 50 cents and 2.50 rupees with a sheet value of Rs. 5.

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.

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.

Present-day souvenir sheets

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.