1x Classified = 1.25 Key

http://backpack.tf/classifieds/search/id/52c8ecb04dd7b82b518b4567

Selling For 1.3 Key:

http://www.tf2outpost.com/trade/19772576

http://www.tf2outpost.com/trade/19844986

http://www.tf2outpost.com/trade/19853885

http://www.tf2outpost.com/trade/19718955 [1 Week]

http://www.tf2outpost.com/trade/19802976 [1.4 Key] - has revenge part

http://www.tf2outpost.com/trade/19858072 [1.4 Key] - SPEC KILLSTREAK WTF?!

http://www.tf2outpost.com/trade/19831768

Unsold For 1.4 Key:

http://www.tf2outpost.com/trade/17274856 [4 Months] bp.tf price

http://www.tf2outpost.com/trade/19594390 [2 Weeks]

http://www.tf2outpost.com/trade/19855068

http://www.tf2outpost.com/trade/19839636

http://www.tf2outpost.com/trade/19808728

http://www.tf2outpost.com/trade/19857284

http://www.tf2outpost.com/trade/19595046 [2 Weeks]

http://www.tf2outpost.com/trade/19836107

http://www.tf2outpost.com/trade/19577384 [2 Weeks]

Conclusion:

-1.4 key is slightly difficult to sell

-a good amount of sellers for 1.3 key

-not very popular

-since there is only 1 1.3 keys seller which was not sold within a week the range is still there

-decent amount of 1.4 key sellers so keeping it in range

feel free to leave a comment :)