3 month old price!

Sale 1:

Sold for 13th Hour Conquistador = 42 keys (no overpay, was offered on)

http://www.tf2outpost.com/trade/26104282 | http://www.tf2outpost.com/trade/26128708

http://backpack.tf/profiles/76561198024608539?time=1433660400 (8th June)

http://backpack.tf/profiles/76561198024608539?time=1433746800 (9th June)

Sale 2:

Sold for Blizzardy Storm Desert Marauder* (23*0.9) + Specialised Australium Scattergun (~34) + Strange Cold Snap Coat (5.5*0.9) = 20.7 + 34 + 4.95 + = 59.65 (rounding to 60 keys)

http://backpack.tf/profiles/76561198091949595?time=1433574000 (6th June)

http://backpack.tf/profiles/76561198091949595?time=1433660400 (7th June)

Mini-suggestion for Blizzardy Storm Desert Marauder*:

http://www.tf2outpost.com/trade/26155499 - B/O of 23 keys

http://www.tf2outpost.com/trade/26138094 - B/O of 23 keys

http://backpack.tf/profiles/76561198065349683?time=1433401200 → http://backpack.tf/profiles/76561198065349683?time=1433487600 - Sold for Duped Max's Head = ~23 keys

~Taking a value of 23 keys.

Conclusion:

Two valid sales at 42 and 60 keys. Taking a final range of 42-60 keys.

Feel free to support/counter my suggestion!