Taking all evidence and comments from this suggestion: https://backpack.tf/suggestion/60ef478b310d2579a756771d

Credits to 2016 FRESHMEN CYPHER, Strange, K1ng and Cheerio for gathering all evidence for this suggestion.

Sale 1 (2016 FRESHMEN CYPHER):

https://mannco.store/item/35491

Keys were at $1.68, $110/$1.68= 65.47 ~Rounding to 65.

Sale 2 (Strange):

https://backpack.tf/profiles/76561198077490243#!/compare/1620259200/1620345600

https://backpack.tf/profiles/76561198120797495#!/compare/1620259200/1620432000

Seems to be untraceable

Sale 3 (K1ng):

https://mannco.store/item/35491

$95/1.8=52.8k

K1ng noted that this sale wasn't really countered at the time of the original suggestion, but since then buyers have risen to 61k+, and the sale itself has become outdated. Excluding.

Sale 4 (Cheerio):

Bulk for a verdant vortex blast defense:

https://backpack.tf/profiles/76561197971174166#!/compare/1627776000/1627948800

(compares from squids inventory untraceable for both trades.)

Sale 5 (Cheerio):

Bought this for 63 pure: https://backpack.tf/profiles/76561198054198170#!/compare/1628294400/1628380800

https://imgur.com/a/0oMUPyp

Older sales from this suggestion (Strange, Cashew): https://backpack.tf/suggestion/6079386ee1b9af17412fb0a9

Credit to A Delicious Cashew for the proof

https://gladiator.tf/listings/6073b1bc4a7c794cbaf6cfa0 b/o 65

https://backpack.tf/profiles/76561198067575136#!/compare/1617840000/1618185600

https://backpack.tf/profiles/76561198077490243#!/compare/1618099200/1618185600

sold for Ancient Eldritch Hellmet (50) + 15

Hellmet Mini: https://backpack.tf/suggestion/607937c4856a30745625ad72 (44-55 keys, mean of 49.5 ~50)

Rounding to 65.

Sale at 65 here supports newer 65 sale. It also suggests that the 53k sale that happened soon afterwards was probably low, as noted by Lemons previously:

https://backpack.tf/profiles/76561198120797495#!/compare/1620259200/1620432000

https://backpack.tf/profiles/76561198077490243#!/compare/1620259200/1620345600

It resold for $95 https://mannco.store/item/35491

$95 / $1.80 = 53 keys

Considering this resold for a lot less than they paid, I'd leave this outdated

In-date sales:

65, 63

Taking 63-65 keys as range.