Hong Kong Team 1977

This is a shirt used by the Hong Kong team in the 1978 World Cup qualifying games. That was a remarkable team and they beat Singapore to top Group 1 at the first stage (see http://www.fifa.com/worldcup/archive/edition=50/preliminaries/preliminary=44/index.html ). Unfortunately, the team lost all 10 games in the AFC/OFC playoff (see http://www.fifa.com/worldcup/archive/edition=50/preliminaries/preliminary=46/index.html ). At the end, Iran became the qualifying team in the AFC/OFC region.
This shirt is characteristics because of the inclusion of the label "FIFA WORLD CUP 1978" under the HKFA team badge. I would be glad if someone knowledgeable can tell me:
1) if this shirt is used only in the final 10 play-off games, or in both the first stage and play-off;
2) who used the number 17 in that tournament.