A tomato called "Field King" is listed in group of genotypes in a table on p.3 of this 1998 research article about genetic divergence in tomatoes. No info about it, though, and of course Field King might not be the same tomato as King of the Field. Link goes directly to a PDF download:
https://www.google.com/url?sa=t&rct=...o&opi=89978449