Do you have any idea what cultivar this is?
I swear I've seen this before, I got one from a farm maybe 5 years ago? It's perfectly smooth and white with mottled blue coloration and striation. My instinct is it's a C. maxima based on the lack of ridges. I poked around online and maybe it's Casper? But the pictures don't really match?
This one's pretty small but the one I got from the farm was decently hefty, 2x the size, perhaps more? Largish jack-o-lantern size I would say.
Cotton Candy may also be a possibility? In that those are seeds I do in fact own? But this grew with no prompting in a friend's garden and she's never seen anything like it before in her life...
Ooo. That stem says maxima for sure. But I'm not sure off the top of my head. To the archives!
IDing white pumpkins is so hard because I swear a lot of catalogs use pictures of all white pumpkins interchangeably, they'll just slap on absolutely whatever picture for whatever variety 🙄
Cotton Candy seems to be a pepo, so I'm gonna say probably not that. Casper is consistently listed as a pepo and then the picture they all put, and it's always the same one, I swear has a maxima stem. I feel like I trust the labels more than the photos but I'm honestly not sure.
The blue tinge is something I understand can happen to a lot of officially white pumpkins in general - if you leave them in the field a bit too long, what was originally pure white will start to lean towards blue or yellow. So it could be that this is one we'll never see marketed as blueish.
Best other possibility I can find is Lumina (which I'm actually growing for the first time now so I'll soon have better intel 🤞) and as a matter of fact I see one listing that warns they have blue tendencies when stressed.