I would call Air-Tite (the manufacturer not the dealer of similar name) and ask directly. They may have a ready-made solution if the domed half dollar doesn't fit in a standard capsule. They've helped me in the past.
Collecting history one coin or medal at a time! (c) commems. All rights reserved.
Why do you want to put it in an Air-Tite? To put in an album? Even if there is a specialized capsule, it'll stand proud of whatever album you put it in.
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