First unusual weapon suggestion, yay

Sale 1: (Pro. KS)

Sold for 24 keys + Spec. KS Aussie Medigun (27)

No outpost

Seller: http://backpack.tf/profiles/76561198045070194#!/compare/1466467200/1466553600

Buyer: http://backpack.tf/profiles/76561198074120641#!/compare/1466467200/1466553600

X = 51

Sale 2:

Sold for Peace sign Safe’n’Sound (18.5) + Pro. KS Gold Botkiller Minigun MK.I (10) + Strange Haunted Beep Man (12) + Killstreak Thunderbolt Sniper Rifle (Minimal Wear) (6)

No outpost

Seller: http://backpack.tf/profiles/765611 98163207749#!/compare/1463702400/1463788800

Buyer: http://backpack.tf/profiles/76561198218623316#!/compare/1463788800/1464048000

X = 47

Sale 3:

Sold for 40 keys

http://www.tf2outpost.com/trade/28146974 - B/O of 40

Seller: http://backpack.tf/profiles/76561197993383111#!/compare/1465084800/1465171200

Buyer: http://backpack.tf/profiles/76561198243786972#!/compare/1465171200/1465776000

X = 40

Sale 4:

Sold for 35 keys

No outpost

Seller: http://backpack.tf/profiles/76561198049369308#!/compare/1463702400/1465603200

Buyer: http://backpack.tf/profiles/76561198100148760#!/compare/1465430400/1465603200

X = 35

Sale 5:

Sold for 33 keys

No outpost

Seller: http://backpack.tf/profiles/76561198100148760#!/compare/1468368000/1468800000

Buyer: http://backpack.tf/profiles/76561198021383012#!/compare/1468368000/1468454400

X = 33

Sale 6: (Pro. KS)

Sold for 28 keys

http://www.tf2outpost.com/trade/28277862 - B/O of 35

Seller: http://backpack.tf/profiles/76561198074120641#!/compare/1466985600/1467072000

Buyer: http://backpack.tf/profiles/76561198021383012#!/compare/1466985600/1467072000

X = 28

Buyer at 28 keys:

http://www.tf2outpost.com/trade/27042026

Sellers:

50 keys:

http://puu.sh/q7Nro/d48d57271f.png - 30 days

65 keys:

http://www.tf2outpost.com/trade/28130623 – 2 months

Sales at:

51

47

40

35

33

28

Sale at 28 is too low, it went to a buyer

Sale at 51 is Pro. KS, excluding as an outlier

47 looks like an outlier here, excluding 47

Sales at 33, 35 and 40 are all pure sales

Going with 33-40