About the dates in sequence :
1 December 1979
2 October 1981
10 December 1981
25 February 1983
.......1983
4 May 1984
19 October 1984
19 December 1985
?????????... do you mean ‘Extralarge ‘ ???
4 July 1991
…………………I do not know
1970
3 January 2002
checking fo the other things and questions ..........