Overprint Stamps of Sri Lanka – 1990

Sri Lanka issued a stamp on Janasaviya Development Programme on 23 Jun 1989. It was a 75 Cents (.75) denomination stamp. On 22 Mar 1990, the same stamp was overprinted as 1.00 and issued. Surprisingly same stamp with denomination 1.00 was also issued on 31 Jan 1990 dated 1990. The Fourth stamp with the same design with denomination 1.00 was issued on 24 Dec 1990 but was undated.No reasons known for such a variety on the same stamp.

Interestingly a Block of Four in my possession has the overprints shifted and listed. RED ARROWS show the error.

sri lanka ovpt shift
SRI LANKA OVERPRINT SHIFT 1989- JANASAVIYA PROGRAMME