I'm hoping Zen will read this. One of the famous NOS 602's. Evidently it's 810 grams. I suppose it's a Medium, not a Medium Hi-Hat, which is probably why it's been unsold. Wonder what it sounds like? I know you could use it for a top, but crashes are not hats, imo.
https://reverb.com/item/25593-paiste-nos-vintage-14-paiste-prototype-medium