Buyers

http://www.tf2outpost.com/trade/25420261 --- 1 Key

http://www.tf2outpost.com/trade/25510487 --- 1 Key

^^^ Proves quicksell price

Sellers

http://www.tf2outpost.com/trade/25707659 --- 1.17 Keys

http://www.tf2outpost.com/trade/25649512 --- 1.23 Keys

http://www.tf2outpost.com/trade/25683660 --- 1.17 Keys

No other sellers for less.

Sales

http://www.tf2outpost.com/trade/25583979 --- Had a part

Quicksold for 1 Key + 4 Ref

http://backpack.tf/profiles/76561198080460423?time=1428130800

Take away 1.5 ref for the part, that's 1 Key + 2.5 Ref (1.15 Keys) that quicksold.

^^^^^^^^^^^^^^^^^^^ SUPPORTING ONLY

http://www.tf2outpost.com/trade/25699533 --- Quicksold for 1 Key

http://backpack.tf/profiles/76561198093846070?time=1429081200

http://www.tf2outpost.com/trade/25599908 --- Quicksold for 1 Key + 5 Ref (I added and asked)

^^^1.29 Keys

1.29 = 1.3

1.17 = 1.2

1.3 was a Quicksell, but sellers for less, so 1.2 is the low end.