I have absolutely no idea.
By way of explanation, I believe I tossed out all my oldest (non-Weber chimneys I've bought). All of my current chimneys, except for one, is a Weber chimney. Of the Weber chimneys, all came used with a grill, so I have no way of really knowing how old any is. After seeing how nice these are, I wound up buying one of the Weber mini chimneys as I've never gotten one as a freebie.
I've also gifted a number of Weber chimneys out to friends & family. I do still have one non-Weber chimeny, but I also got that with a grill. Only reason I kept it was because it had that release in the handle to dump the bottom flap & the coals so you don't have to turn it upside down. I remember seeing them back in the day, so I kept it, but haven't used it. I think it is a Char-Broil and it LOOKS like the oldest, but THAT might be because it wasn't made as well.