As mechanickal says, try it on here, but also have you tried Gumtree in the UK? Might be an option.
Create an account with one of the European eBay sites, e.g. eBay.de, and you should be able to list there although UK buyers will be blocked but the rest of the world will see it if you choose.I`ve done this in the past but I don`t guarantee it`s still possible.
I'd say list it here and sites that are EDC themed. Being new might make some hesitate but at least you'll get it in front of the target audience. Good luck.
Another option is to try and sell it here on the forum in the "trades" section.We're all tool enthousiasts here so it'll definitely go to a good home then.
A wonderful piece of kit? As I see it it is all the pieces of a kit and then some.
Hey even if you end up not listing it here, make sure to post a picture of it so we can drool over it