Alot of sales on this headspitter:

Sale 1:

https://backpack.tf/profiles/76561198337734785#!/compare/1575504000/1575590400

https://backpack.tf/profiles/76561198125736016#!/compare/1575417600/1576195200

Bulk

Sale 2:

https://backpack.tf/profiles/76561198063029230#!/compare/1576627200/1576713600

https://backpack.tf/profiles/76561198418740133#!/compare/1576540800/1576627200

Bulk

Sale 3:

https://backpack.tf/profiles/76561198418740133#!/compare/1580342400/1580428800

https://backpack.tf/profiles/76561198337964980#!/compare/1580342400/1580515200

Sold for 20 keys pure

Sale 3:

https://backpack.tf/profiles/76561198337734785#!/compare/1575763200/1575849600

https://backpack.tf/profiles/76561198850274253#!/compare/1575590400/1575849600

Bulk

Sale 4:

https://backpack.tf/profiles/76561198411024073#!/compare/1574899200/1574985600

https://backpack.tf/profiles/76561198269484722#!/compare/1574812800/1574899200

Excluding

Sale 5:

https://backpack.tf/profiles/76561198103200620#!/compare/1581897600/1581984000

https://backpack.tf/profiles/76561197968633696#!/compare/1581897600/1581984000

Bulk

Sale 6:

https://backpack.tf/profiles/76561198080179568#!/compare/1578614400/1578700800

https://backpack.tf/profiles/76561198379794509#!/compare/1578614400/1578700800

Unknown

Sale 7:

https://backpack.tf/profiles/76561198445049721#!/compare/1579305600/1579392000

https://backpack.tf/profiles/76561198379794509#!/compare/1579305600/1579392000

Sold for 16 keys pure

Sale 8:

https://backpack.tf/profiles/76561198445049721#!/compare/1580774400/1580860800

https://backpack.tf/profiles/76561198410099666#!/compare/1580860800/1580947200

Sold for 22 keys

Sale 9:

https://backpack.tf/profiles/76561198281941056#!/compare/1577923200/1578441600

Unknown

Sale 10:

https://backpack.tf/profiles/76561198233317884#!/compare/1576540800/1577059200

https://backpack.tf/profiles/76561198055622215#!/compare/1576540800/1576627200

Use there

Sale 11:

https://backpack.tf/profiles/76561198810076577#!/compare/1577318400/1577404800

https://backpack.tf/profiles/76561198055622215#!/compare/1577318400/1577404800

Use there

Sale 12:

https://backpack.tf/profiles/76561198143588753#!/compare/1577664000/1578528000

https://backpack.tf/profiles/76561198046393528#!/compare/1577404800/1578009600

Unknown

Sale 13:

https://backpack.tf/profiles/76561198337734785#!/compare/1577750400/1577836800

https://backpack.tf/profiles/76561198107902105#!/compare/1577491200/1577836800

Unknown

Sale 14:

https://backpack.tf/profiles/76561198107902105#!/compare/1578096000/1578528000

https://backpack.tf/profiles/76561198295486957#!/compare/1578441600/1578528000

QSed

Sale 15:

https://backpack.tf/profiles/76561198295486957#!/compare/1578528000/1578614400

https://backpack.tf/profiles/76561198887873596#!/compare/1578528000/1578614400

Unknown

Sale 16:

https://backpack.tf/profiles/76561198152219414#!/compare/1579132800/1579219200

https://backpack.tf/profiles/76561198887873596#!/compare/1579046400/1579219200

Bulk

Sale 17:

https://backpack.tf/profiles/76561198152219414#!/compare/1579219200/1579305600

https://backpack.tf/profiles/76561198273866103#!/compare/1579219200/1579305600

Sold with 5 keys for Blizz Gibus = Use there

Sale 18:

https://backpack.tf/profiles/76561198273866103#!/compare/1579564800/1579651200

https://backpack.tf/profiles/76561198074149928#!/compare/1578700800/1579651200

Sold for 16 keys pure

Sale 19:

https://backpack.tf/profiles/76561198074149928#!/compare/1580256000/1580428800

https://backpack.tf/profiles/76561198992543547#!/compare/1579910400/1580256000

Sold for 20 keys pure

Sale 20:

https://backpack.tf/profiles/76561198992543547#!/compare/1581552000/1582243200

https://backpack.tf/profiles/76561198208823517#!/compare/1581465600/1581552000

Sold for Gfetti Tyrant Helm + 2 keys pure - Unusuable

Sale 21:

https://backpack.tf/profiles/76561198208823517#!/compare/1581552000/1581638400

https://backpack.tf/profiles/76561198179131749#!/compare/1581552000/1581638400

Sold for MW Lucky Shot + 1 keys (17 keys)

Sale 22:

https://backpack.tf/profiles/76561198063075911#!/compare/1577923200/1578355200

https://backpack.tf/profiles/76561198059600803#!/compare/1577664000/1578009600

Unknown

Sale 23:

https://backpack.tf/profiles/76561198037772474#!/compare/1577577600/1577664000

https://backpack.tf/profiles/76561198964631813#!/compare/1577577600/1577923200

Unknown

Sale 24:

https://backpack.tf/profiles/76561198057686137#!/compare/1582243200/1582329600

https://backpack.tf/profiles/76561198055847835#!/compare/1582156800/1582243200

Sold for 16 keys pure

Sale 25-31:

https://marketplace.tf/items/tf2/291;5;u62

$25.71 / $1.67 = 15.40 keys - Low

$33.65 / $1.78 = 18.90 keys

$28.89 / $1.77 = 16.32 keys

$31 / $1.77 = 17.51 keys

$32 / $1.77 = 18.08 keys

$37.95 / $1.77 = 21.44 keys

$37.99 / $1.76 = 21.59 keys

$35/1.75 = 20 keys

Taking 16-22 keys