1 of 1 in existence!

Sale 1:

Sold for Australium Medi Gun (~30) + Specialised Australium Minigun (~20) + Specialised Australium Blutsauger (~11) = 61 keys

http://www.tf2outpost.com/trade/27800319

http://backpack.tf/profiles/76561198047822818/#!/compare/1455955200/1457856000

Notes:

Only one recent sale; histories of the items match. This should be fine.

http://www.tf2outpost.com/trade/27968823 - B/O of 80 keys

Conclusion:

One valid sale at 61 keys. Taking a final flat price of 61 keys.

Feel free to support/counter my suggestion!