1 year old price!

Sale 1:

Sold for Cloud 9 Texas Tin-Gallon (13.5) + Professional Australium Flame Thrower (~27.5) = 40 keys

http://www.tf2outpost.com/trade/28008729

http://backpack.tf/profiles/76561198259305993/#!/compare/1459641600/1459728000

http://backpack.tf/profiles/76561198021228339/#!/compare/1459641600/1459728000

~ Seller wiped out his notes but he probably had a B/O of around 30 keys. If not, then this is an outlier compared to other recent B/Os and sales

Sale 2: (going to be used to price the crown)

Sold with Haunted Ghosts Prince Tavish's Crown for Phosphorous Prince Tavish's Crown

http://www.tf2outpost.com/trade/28038406 | http://www.tf2outpost.com/trade/28051501

http://backpack.tf/profiles/76561198057516533/#!/compare/1460073600/1460160000

http://backpack.tf/profiles/76561198042263127/#!/compare/1460073600/1460160000

Sale 3:

Sold with Purple Energy Bear Necessities for Kill-a-Watt Specialised Killstreak Crone's Dome

http://www.tf2outpost.com/trade/28034554

http://backpack.tf/profiles/76561198042263127/#!/compare/1459728000/1459900800

http://backpack.tf/profiles/76561198259305993/#!/compare/1459814400/1459900800

Sale 4:

Sold with Circling Peace Sign Exquisite Rack (68) for Sunbeams Old Guadalajara (86.5) + 15 keys = ~33.5 keys (B/O caps it at 30 keys)

http://www.tf2outpost.com/trade/27939671

http://backpack.tf/profiles/76561198087536921/#!/compare/1457856000/1457938800

http://backpack.tf/profiles/76561198021228339/#!/compare/1457856000/1457938800

Notes:

http://www.tf2outpost.com/trade/28051501 - B/O of 29 keys

http://www.tf2outpost.com/trade/27924800 - B/O of 30 keys

http://www.tf2outpost.com/trade/28058264 - B/O of 30 keys

Conclusion:

One valid sale at 30 keys and another sale at ~40 keys which probably had a B/O lower than that. Price has remained somewhat stable but this suggested price is better than the current outdated range. Taking a final flat price of 30 keys.

Feel free to support/counter my suggestion!