This isn't a normal item. This is a item that has been gifted by Robin Walker the creator of TF2. Only a few of these exist as he only did this for charity events to the highest donator.
This is a glitched weapon. It's a Strange weapon but shows as being Unique quality. These were part of a halloween glitch a few years back where any item you unboxed was like this. 1 of 3 item.
1,000 Keys Pure.
[^Will Pay More Than This Guy^] Tradeable (160) or Giftwrapped (100). (You can no longer Giftwrap this item. It needs to already be wrapped from years ago when you still could. Willing to negotiate.