Agreed that this is not a Rolex Sub insert. What is you goal regarding the insert? If you are looking for the correct insert, it would probably be a red-triangle, and the price would be astronomical, if you can even find one. Or are you just looking for an insert that would be a plausible service part for this watch? In that case, you just want some sort of 60s or 70s fat-font insert, and I'm not sure it really matters which one you use, since it wouldn't be original anyway. Even there, you're probably looking at about $2k USD, but at least they are readily available.
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