I know this is kind of a long shot, but I ended up picking up the Nuclear Data set once upon a time, along with a ton of the child deals, but I bought the blank ISO enter key, and not the one that was part of the ISO set (I think the text was "Return"). Why? I don't remember. Do I regret it now? Yup.
I'd be willing to pick one up at a more-than-reasonable price if you have one kicking around somewhere, and I would make you an offer for just that, or as part of a large pile of Nuclear Data or SA row 3 keys you might have leftover after finishing your board.
