Mine's a sticker. There's also a sticker by the valve saying not to inflate over 55 psi (non-reinforced clinchers). Yours is a couple years later, so it may have changed and, really, nobody will know, so go whatever style you like best IMO, but in the interest of helping, my Iver's originals(?) had a round profile tubeless rim. Basically, what I got from CB Italia, but if the flat sides were cut down, leaving just the rounded crown. Originals:
View attachment 868876
View attachment 868877
As an aside, my and two adjacent towns had a bunch of gas main explosions causing over 70 fires (somehow only one fatality, though still sad—18 year old kid sitting in his car got crushed by a falling chimney), so they evacuated the whole town. I got the kids out, grabbed my computer and a laundry basket full of clothes, set the Iver and my USAAF bike (my most comfortable and versatile one and it was near the garage door) outside in the yard far enough from the house and behind a tree that it would probably be OK if it blew up, and left. Nothing blew up and the bikes were fine. We live in the woods on a fairly hidden 1/4 mile drive surrounded by unswimmable ponds and woods, so I wasn't worried about theft. Point is, in a pinch, the first object I looked to save after my laptop, which just comes with me, was the Iver.