Can't trade "Dueling Mini-Game"

[Vanes #savetf2]

I have this item as drop from the game and I'd like to trade it.

I suppose it should be located at tab "Items" but it doesn't show although when I tried make e.g. auction, Scrap.tf sees this item in my inventory.

Is the "Dueling Mini-Game" not tradable in this service or what?

Backpack.tf says that it costs 0.61 ref

[Maxsundux]

It seems scrap.tf is not buying or selling dueling mini-games at the moment.