He returned to Trinidad Tobago with the national team in September of 1981 for two friendly Internat

After his 1976 exhibition in Suriname with the Guyana under-18 Inter Guiana games team it was no surprise when Cuban Coach George Nelson and Raven's Icon, Hewley Henry introduced 19 year old Stanislaus (KNOX) Hadmon  for his International Debut against the touring Canadians, Montreal YMCA, June 1978 at the National Sports Hall.
Bill De Horne supported Farroba with 33 points. For Guyana, free park and fly hotels new orleans airport Stalwart Mike Brusche top scored with 16 points while Debutant Stanislaus Hadman lent admirable support with 15 points.  His next international assignment was November 1978 to Barbados for that country's independence anniversary, Trinidad and Tobago also participated.
The following year (1979) Trinidad Tobago toured Guyana for a four match international series which the visitors won 3 Games to one after Guyana free park and fly hotels new orleans airport led by Eagles duo Merton Fitzalbert 17 points and Stanislaus Hadman 11 points won the series opener. 'Knox' free park and fly hotels new orleans airport next international engagement was Trinidad and Tobago for a triangular series free park and fly hotels new orleans airport involving Guyana, Trinidad Tobago and Barbados in September free park and fly hotels new orleans airport of (1980).
And when Suriname National Team visited in December of the same year 'Knox' helped Hewley Harry's men destroyed the Dutchmen 2 Nil.  His biggest moment as an International Player came when Guyana hosted the Inaugural Caricom championship in August of 1981.
Hadmon led all scorers with 24 points when Guyana humbled free park and fly hotels new orleans airport Dominica on the opening night of the championship, he also scored 24 points in the second win against Antigua and Barbuda, 17 points against Barbados in a losing cause and 22 points vs Jamaica when Guyana lost the semifinals.
In the game to decide whether Barbados or Guyana would finish third, Hadman scored a recording breaking 34 points which ensured that the land of the mighty Kaieteur free park and fly hotels new orleans airport Falls secured the bronze medal and in the process he became the first man in the Caribbean to score over 120 points at a Caricom Championship.
'Knox' finished the (1981) tourney with 121 points from five (5) matches, his average of 24.2 points per game is still the best by a Guyanese male at a Caricom free park and fly hotels new orleans airport championship and also his 100 percent free throw accuracy from the line.  His 34 points against Barbados was the highest by a Guyanese at the Caricom championship level until 2007 when Washington based DC Jammers Gordon Klaiber equalled the feat against Antigua Barbuda at the Puerto Rico championship.
He returned to Trinidad Tobago with the national team in September of 1981 for two friendly International games as the host prepared for a historical tour of China.  Hadman played his last International match for Guyana against the Cayman Islands at the national Arena in Kingston Jamaica in December 1982, at the Caricom Championship he was selected in Guyana's (1983) Caricom squad but the championship was cancelled.