Sportkings sports cards contain baseball, basketball, football and other sports and span players from past olympics in addition to hall of fame players along with legends from past years. They can also be called Sport Kings, with a space, though I think Sportkings is the proper grammar for them.
Sportkings baseball cards were established in 1933 according to the sticker on the cards. Looking at the Beckett price guide that I have here, 1933 Sport Kings had cards of Ty Cobb, Babe Ruth and Carl Hubbell and they look like classic cards, similar to the style that the new 2007 and 2008 Sportkings cards have as they implemented that classic design again for the base cards.
Some of the autographs, memorabilia and autographed memorabilia in these cards are astounding. I recently purchased a Hakeem Olajuwon certified authentic autographed card from 2007 Sportkings Series B and here is a picture of it if you would like to see it http://www.mybaseballcardspace.info/?cmd=viewphoto&id=1&viid=508
Listed below are some of the Sportkings legendary cards for sale, mostly from the more recent years. Unopened boxes are available too based on availability.
http://www.mybaseballcardspace.info/Star_Company_Bagged_Set
http://www.mybaseballcardspace.info/1984_85_Star_Company
http://www.mybaseballcardspace.info/1983_Star_Company
http://www.mybaseballcardspace.info/Star_Company_Listings
1989 Score Football 1989 Topps Baseball 1982 Topps Baseball 1983 Topps Baseball 1983 Star Company
Star Company Bagged Set 1986-87 Fleer 1993 Bowman 1992 Bowman 1985 Donruss
1981 Topps Baseball 1988 Topps Baseball 1980 Topps 1987 Topps 1985 Topps Baseball
vintage card 1951 Bowman 1953 Topps 1951 Bowman Mickey Mantle 1980-81 Topps
Upper Deck Exquisite Basketball 1987-88 Fleer Basketball 1981-82 Topps