3 month old price!

Sale 1:

Sold for 45 keys (not a quicksell, took nearly a month to sell)

http://www.tf2outpost.com/trade/26798641

http://backpack.tf/profiles/76561198053210856?time=1442041200 (September 12th)

http://backpack.tf/profiles/76561198053210856?time=1442127600 (September 13th)

http://backpack.tf/profiles/76561198053210856?time=1442041200&compare=1442127600

Sale 2:

Sold for Max's Severed Head (28) + Specialised Strange Festive Rocket Launcher* (18*0.9) + Sweets (~8*0.9) = 51.4 (rounding to 51 keys)

http://www.tf2outpost.com/trade/27209675

http://backpack.tf/profiles/76561198031371895?time=1444546800 (October 11th)

http://backpack.tf/profiles/76561198031371895?time=1444633200 (October 12th)

http://backpack.tf/profiles/76561198031371895?time=1444633200&compare=1444546800

http://i.imgur.com/udDYbEY.png

Sale 3:

Sold for Gifted Specialised Australium Rocket Launcher = ~54 keys (gifted deducts value but killstreak should make up for it)

http://backpack.tf/profiles/76561198041625769?time=1444546800 (October 11th)

http://backpack.tf/profiles/76561198041625769?time=1444656768 (October 12th)

http://backpack.tf/profiles/76561198041625769?time=1444656768&compare=1444546800

Mini-suggestion for Specialised Strange Festive Rocket Launcher*:

http://backpack.tf/stats/Strange/Specialized%20Killstreak%20Festive%20Rocket%20Launcher/Tradable/Craftable

~Average value of 18 keys.

Notes:

http://www.tf2outpost.com/trade/26798641 - B/O of 50 keys

http://www.tf2outpost.com/trade/27220173 - B/O of 65 keys

Conclusion:

Three valid sales at 45, 51 and 54 keys. Taking a final range of 45-54 keys.

Feel free to support/counter my suggestion!