This seller often makes unofficial variations by swapping scales. I don't believe this is official. It's just a Trekker with Hunter/Hiker XT orange dual-density handles. I usually buy scales, sheaths, and other small parts (toothpicks and tweezers) from him often.
I have a question out to the seller to get some more info. For some reason, I was thinking the DD scales were difficult or impossible to change, but I'm probably wrong about that.
I just purchased a Hunter XS because it was super-cheap (22 euros) and I couldn't resist the orange.It's very weird not having the opener layer. But it's such an awesome looking SAK. I'd love to know if I could put these on a Workchamp for example.