Sale 1:

Sold for 19 keys

http://www.tf2outpost.com/trade/27724278 - B/O of 20

Seller: http://backpack.tf/profiles/76561198119629032/#!/compare/1453622400/1453795200

Buyer: http://backpack.tf/profiles/76561198177208719/#!/compare/1453708800/1454140800

X = 19

Sale 2:

Sold for 11 keys?

Seller: http://backpack.tf/profiles/76561198065405581/#!/compare/1454313600/1454400000

Buyer: http://backpack.tf/profiles/76561198108525949/#!/compare/1454313600/1454400000

X = 11

Sale 3:

Sold for Orbiting Planets Sultan’s Ceremonial + 5 keys

http://www.tf2outpost.com/trade/27919614 - B/O of 16

Seller: http://backpack.tf/profiles/76561198108525949/#!/compare/1458284400/1458370800

Buyer: http://backpack.tf/profiles/76561198061755956/#!/compare/1456214400/1459296000

X = ? + 5

X = 16

Sultan Mini:

Buyer at 10 keys

http://www.tf2outpost.com/trade/27934308

Therefore, the Sultan cannot be 10 keys or less, which would cap the sale at the buyout.

Sellers:

20 keys:

http://puu.sh/o1Bi6/0ba7216f73.png - 1 month

21 keys:

http://www.tf2outpost.com/trade/27972688 - 1 week

25 keys:

http://www.tf2outpost.com/trade/27764742 - 2 months

26 keys:

http://www.tf2outpost.com/trade/28009279 - 2 days

Buyers:

11 keys:

http://www.tf2outpost.com/trade/27760065

http://www.tf2outpost.com/trade/27991717

http://www.tf2outpost.com/trade/27938534

http://www.tf2outpost.com/trade/26125619

http://www.tf2outpost.com/trade/27808607

Any sales at 11 or lower are too low.

Sales at:

11 (pure)

16

19 (pure)

Going with 16-19