Update!

Sale: https://marketplace.tf/items/tf2/779;5;u90 - 100/1.83 = ~55

404 history not found.

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Credits to Surs:

Another sale: sold for 42 keys

https://backpack.tf/profiles/76561197966756586#!/compare/1600473600/1600560000

https://bot.tf/stats/listings/4KVKK2X8

Sold in about 2-3 days.

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Additional by Xergoyf:

Looks like the history for the sale you found was also the one for the mp sale:

https://backpack.tf/item/3354373181

https://backpack.tf/profiles/76561198117282823#!/compare/1585526400/1596326400

https://backpack.tf/profiles/76561198216476829#!/compare/1591747200/1596672000 - mp bot obtained some time between early June and early August

https://backpack.tf/profiles/76561197966756586#!/compare/1599782400/1599955200 - buyer upgraded to a duped Secret Honcho's less than a week from buying

I would prefer a range here, 42 - 55 should be fine

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42-55.