I really don't know; I got the seeds from a huge watermelon from my greatuncle's farm last year. I thought "what a melon! I'm gonna plant these next year". I've compared a couple pictures online and it looks like the sugar baby variety. But it's parent melon sure wasn't that small!
Darn those genetics.
Guess the parent plant got pollen from a runty plant; who knows. Anyway, just wondered on how to tell when they're ripe.
Thanks for the idea on stems, certainly makes more sense. I'll check next time i'm out there.