Item 1:

https://backpack.tf/item/14785425691

Sale 1, 2, 3:

https://marketplace.tf/items/tf2/31461;5;u346

Sold for $41 on the 26.07, 01.08, 21.08

Keys were:

https://marketplace.tf/items/tf2/5021;6

26.07 - $1.95 (41/1.95) = 21.02 (Rounding to 21)

01.08 - $1.9 (41/1.9) = 21.57 (Rounding to 22)

21.08 - $1.84 (41/1.84) = 22.2 (Rounding to 22)

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Item 2:

https://backpack.tf/item/14748799785

Listed on mannco

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Item 3:

https://backpack.tf/item/15470456333

Sale 4:

https://backpack.tf/profiles/76561198378816276#!/compare/1745107200/1752537600

https://backpack.tf/profiles/76561199854367625#!/compare/1752192000/1752537600

Untrace

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Sellers:

BPTF - https://imgur.com/a/ET6IasH - 1 @ 22 keys

MPTF - https://marketplace.tf/items/tf2/31461;5;u346 - 1 @ $41, 1 @ 44.99

STN - https://stntrading.eu/item/tf2/Unusual+Butterfly+Season+Vaudeville+Visor - None

SCM - https://steamcommunity.com/market/listings/440/Unusual%20Vaudeville%20Visor?filter=Butterfly+Season - https://imgur.com/a/ZMydSuw - 1 @ $111.81AUD (~30 keys)

Sale(s):

21, 22, 22

Going with 21 - 22 keys