Sale 1:

https://backpack.tf/profiles/76561198208062409#!/compare/1520035200/1520467200

https://backpack.tf/profiles/76561198054145550#!/compare/1520380800/1520467200

Sold for Duped Strange Sulphrous Ground Control

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Sale 2:

https://backpack.tf/profiles/76561198054145550#!/compare/1520640000/1520726400

https://backpack.tf/profiles/76561198105071091#!/compare/1520640000/1520726400

Sold for L'Homme Burglerre(80)

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Sale 3:

https://backpack.tf/profiles/76561198105071091#!/compare/1520985600/1521072000

https://backpack.tf/profiles/76561198304830713#!/compare/1520812800/1521072000

Sold with a key for Blizzarsy KE + Festivized Spec KS Aussie Tomislav(13)

KE Mini:

https://backpack.tf/profiles/76561198306288794#!/compare/1521849600/1521936000

https://backpack.tf/profiles/76561198079170528#!/compare/1521936000/1522022400

Sold for 43 keys.

https://backpack.tf/profiles/76561198026198026#!/compare/1522368000/1522454400

Sold with 16 ref for 55 keys, traceable through key histories.

https://backpack.tf/profiles/76561198026198026#!/compare/1522454400/1522540800

https://backpack.tf/profiles/76561198155476440#!/compare/1522454400/1522540800

Sold for 20 keys + Time Warp Cone

https://backpack.tf/suggestion/5ac6ca06cf6c753eb31a1652

Taking from this suggestion for a price of 32.5 keys

Total is 52.5 keys.

Taking 53 - 55 keys, average of 54 keys.

Total is 54 + 13 = 67 keys

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Sale 4:

https://backpack.tf/profiles/76561198179707937#!/compare/1521072000/1521158400

Sold for Anti Freeze Fukaamigasa

Fukaa Mini:

https://backpack.tf/profiles/76561198209584000#!/compare/1521072000/1521158400

https://backpack.tf/profiles/76561198077746093#!/compare/1521072000/1521158400

Sold for Misty Bucket(56.5)

http://www.tf2outpost.com/trade/29591582

B/O of 58 keys for different sale.

Taking 57 - 58, as B/O was part of large pure sale.

Taking 57.5 keys.

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Total sales @:

57.5, 67, 80

Considering Strange version was sold for 17 key taunt, and listed @ 65 now, plus unsold at 80 for 4 months, calling 80 an outlier.

Taking 58 - 67 keys.