7 months old price. Really hard to sell at 13 keys, 12 keys is reasonable and I'm setting a low end at 11 keys due to sales. 2 sellers at 12 keys in classifields.

Unsolds:

http://www.tf2outpost.com/trade/19681346 - 12 keys, a few hours (Very young)

http://www.tf2outpost.com/trade/19674761 - 12 keys, a few hours (Very young)

http://www.tf2outpost.com/trade/19056000 - 20 keys, 1 month

http://www.tf2outpost.com/trade/19517881 - 13 keys, 1 week

Solds:

http://www.tf2outpost.com/trade/19660073 -Nuts n bolts gridiron guardian + ~5 ref in sweets (15-16 keys, outlier)

http://backpack.tf/profiles/76561198079480554?time=1399359600 > http://backpack.tf/profiles/76561198079480554?time=1399446000

http://www.tf2outpost.com/trade/19587022 - 11 keys + ~5 ref in items (~11.5)

http://www.tf2outpost.com/trade/19661680 - 12 keys

http://www.tf2outpost.com/trade/19648602 - 10 keys (Quicksell)

Gridiron Guardian mini suggestion:

http://www.tf2outpost.com/trade/17497501 - 16 keys

http://www.tf2outpost.com/trade/19662996 - Selling for 15 keys

Setting a value of 15-16 keys.

Update: First, Second link sold for 12