The base looks right, like a corm. I only grew glads once, a row of them, and when I lifted them they had produced hundreds of tiny corms. I was weeding odd plants out for a couple of years, anyway, I am sure some were a good bit smaller than that. I don't know if it is big enough to give you a flowering plant first year, as I say I only grew them once and that was a while ago, but at a guess I would say they are what they say on the box, sorry, unmarked plastic bag, hmmm.
Maybe someone who grew some and when he lifted them found ...