...I just had a weird thought... what if this IS what the new/retro Vader helmet looks like in Kenobi? A mash up of film faceplates plus the little dome?
I bought several of these for gifts at WallyWorld a few years ago when they were on sale for $50 each. I lucked out. The 5 year old me wanted to be Vader SO BAD back in the 1970s, I really wanted the Don Post version (never got it until I was in college). I would have literally passed out if someone had given my the Black Series helmet back then.
If Hasbro they would just make the dome bigger, I think it wouldn't look so weird.
BTW: I won't link to a live auction, BUT if you search EvilBay right now for Darth Vader helmet, you'll see an Altmann's licensed Vader (originally from Australia) up for sale. These were modified from the original sculpt that was sent to Lucasfilm licensing IIRC, and the final product looked even more wonky. Here's pics from Jez' site:
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ttp://www.starwarshelmets.com/ausdv2.jpg