Yeah, I was thinking that it looked young, but not
very young, like it hadn't far to go to reach its adult size.
Your rabbit is a cute little mutt. It might be the result of only a two-way mix like Mini Rex and Holland Lop, or it could be a blend of several small breeds. But I think we can pretty safely eliminate Checkered Giant as being a participant in that particular gene pool.
@Weehopper - what you said reinforces what I was saying. There are lots of folks that breed meat-type rabbits and mix 'em up or keep them purebreds but may not even know there are such things as rabbit shows. And there are lots of folks who breed smaller rabbits with an eye toward selling as pets, who have no interest in showing. Either of these groups might be selling at a flea market or auction or something where you might not be sure about what you were getting. But since the Checkered Giant doesn't fit either of those categories, it's pretty unlikely that someone who isn't at least somewhat interested in showing would even have one, and if they did, they most likely had to go looking for a breeder to find it, so they would know what they had. I suppose you could turn one up in a rescue, but that would probably be a mature animal.
@silly4buttons What you are describing might have been a head injury, but it sounds an awful lot like an episode of wry neck.
https://barbibrownsbunnies.com/wryneck/
Some rabbits die from this condition, some don't recover, and some seem to recover completely. However, if a rabbit has done this once, any time it experiences a stress, it can happen again. I strongly advise you to start your rabbits on a prevention program,