also known more formally as Saint Christopher Island, is an island in
the West Indies. The west side of the island borders the Caribbean Sea,
and the eastern coast faces the Atlantic Ocean. Saint Kitts and the
neighbouring island of Nevis constitute one country: the Federation of
Saint Kitts and Nevis. Saint Kitts and Nevis are separated
by a shallow 3-kilometre channel known as "The Narrows". The
island is one of the Leeward Islands in the Lesser Antilles.The land
area of St. Kitts is about 168 km2, being approximately 29 km
long and on average about 8 km across. Saint Kitts
has a population of around 35,000, the majority of whom are mainly of
African descent. The primary language is English, residents call
themselves Kittitians. [R1]
Saint Kitts and Nevis, in the Leeward Islands, issued general issues concurrent
with those of the Leeward Islands from 1903 until July 1, 1956. From
1952 the stamps were inscribed as "St. Christopher Nevis and Anguilla".
It achieved Associated Statehood on February 27, 1967 but on June 23, 1980, separate postal
administrations were established, one for Saint Kitts, the
other for Nevis
and different issues were produced, despite remaining as one nation.
Since early 2000th Saint Kitts start to produce many Souvenir
Sheets pro year, amount of stamps starts to grow too.[R2]
Official stamps of Saint Kitts related to Paleontology: dinosaurs and other prehistoric animals
18.04.1994 "Prehistoric Aquatic Reptiles"
(with and without overprint with logo 'Hong Kong '94') 
 These stamps issued one the same day, with and without overprint of 'Hong Kong 94' logo on bottom right corner.
There are some sheets where both variations printed together.
One with the overprint, other without with text separation in between (left gutter pair - upper row is without but lower row is with the overprint - better scan wanted).
Other sheets contain only flavor (right gutter pair - all stamps are without the overprint).
References: [R1] More information
about Saint Kitts is on WikipediaWikiTravel [R2] More information about
postal history of Saint Helena on: Wikipedia
Many thanks to fellow collector Dr. Jon Noad from Canada for his help to find some images and information about prehistoric stamps of Saint Kitts 1994.