1 of 1 in existence!

Sale 1:

Sold for 5 buds + a massive amount of sweets (~0.5 after overpay) = 5 + ~0.5 = ~5.5 buds

http://www.tf2outpost.com/trade/24855599

http://backpack.tf/profiles/76561198103265170?time=1423376832 & http://i.imgur.com/6JpGllh.png

Sale 2:

Sold with 5 buds for Poisoned Shadows Swagman's Swatter (invalid sale, outdated hat)

http://www.tf2outpost.com/trade/24987563

http://backpack.tf/profiles/76561197970115262?time=1423403221 → http://backpack.tf/profiles/76561198095756294?time=1423382400

Sale 3:

Sold for 6 buds

http://www.tf2outpost.com/trade/24994907

http://backpack.tf/profiles/76561198095756294?time=1425110400

Sale 4: (obvious outlier)

Sold for a Smoking German Gonzilla?

http://backpack.tf/profiles/76561198136670320?time=1422410748 → http://backpack.tf/profiles/76561198136670320?time=1422432000

Notes:

For valuing the buds, I'm using the price at the time of sale. Using all recorded sales that have occurred since the unbox of this hat.

Conclusion:

Taking a final range of 5.5-6 buds.

Feel free to support/counter my suggestion!