the duelling banner is not an item you use, it will appear automatically if you challenge (or someone) challenges you to a duel. It's a fancy banner that comes down and swirls around just before your duel begins.
So its not an item, even though it says so in the collection. But ask someone for a duel on the character you used it on and you will see it 🙂
Alright, Thanks for the clarification 🙂
There is an Toy called Duell Banner (not sure about exact name) I sold one a few days ago,
it could that it is handeld like an emote.
Okay looked it up in my Collection, there is an Toy called Duelling Banner (name may vary my Client is in German)
That is an Toy, so you should have it as an Item in your Inventory.
Your Toy Cube is really gone, there is no Item?
Not in your Inventory, your bank, legacy Bank, Gildbank you didn't sold it to a Vendor accidentally?
Nope, I was not near a vendor, when it happened.
