What is the Exceedingly Rare Special item?

Question

So a recent update turned CS:GO into a microtransaction model similar to DotA2 and TF2.

As such, one of the weapon crates lists:

                              eSports 2013 Case

                            Base Grade Weapon Case
                                Case Series #2

This case contains one of the following:
    - M4A4 | Faded Zebra
    - MAG-7 | Memento
    - FAMAS | Doomkitty
    - Galil AR | Orange DDPAT
    - Sawed-Off | Orange DDPAT
    - P250 | Splash
    - AK-47 | Red Laminate
    - AWP | BOOM
    - P90 | Death by Kitty
      or an Exceedingly Rare Special Item

So what is this Exceedingly Rare Special Item? Is it like TF2, where hats would be uncrated with the Unusual particle effect, and do weapons get that too? Or is it something else entirely?

Answer 1

The 'Exceedingly Rare Special Items' are the different knife models. Knives unboxed can come in either a normal version or also have the chance of coming with StatTrak.

From Steam News:

Weapon Cases have a chance to contain new knives and StatTrak weapons, which track all player kills with that weapon.

The different knives that can be unboxed are:

• Bayonet
• M9 Bayonet
• Gut Knife
• Flip Knife
• Karambit
• Huntsman Knife
• Butterfly Knife
• Falchion Knife

The ★ symbol is the CS:GO version of Unusual. Knives unboxed will have the following name:

★ KNIFE_TYPE | PATTERN

So if you unboxed a Flip Knife Night, you would see:

★ FLIP KNIFE | NIGHT

Answer 2

Last night I unboxed an Exceedingly Rare Special Item. It was a ★ Gut Knife | Blue Steel. And I'm loving it.

Answer 3

Nope.

The Exceedingly Rare Special Item is YELLOW according to the crate description.

Purple is Classified.

Strange aka StatTrak are Orange versions of weapons.

And on top of that there are different finishes, NEW being the best.