Here are some sales to support the raise:

http://www.tf2outpost.com/trade/27918219 - 13.33 ref

http://i.imgur.com/jX0JU7d.png - 13.33 ref

http://www.tf2outpost.com/trade/27713203 - 13 ref

Plus a buyer at 13 ref:

http://www.tf2outpost.com/trade/27749167

I actually looked into this after I sold mine and this had a messy market, with sellers at 12.66-13 ref and even a buyer at 13.88 ref o_O So I was basically polarized on what to do, lol. Most have disappeared, including the buyer at 13.88 ref Edit: Found it, poorly bumped though, so you can disregard that as well http://www.tf2outpost.com/trade/28006262

There are actually still a few sellers at 12.66-13 ref. All are either poorly bumped or wanting "backpack.tf prices" though, so you can disregard them. Upvote.