Resuggesting with a new range due to new proof, which I owe to Vege. Some of the proof here is old since the suggestion was pending for 2mos but this definitely needs an update.

Original suggestion: https://next.backpack.tf/suggestions/63600b16efce27929a02f426

Backpack.tf - 4 sales

https://backpack.tf/item/5029739675 - 80 keys

https://i.imgur.com/0I6tglN.png

https://backpack.tf/profiles/76561198032789419#!/compare/1666656000/1666742400

https://backpack.tf/profiles/76561198055622215#!/compare/1666656000/1666742400

https://backpack.tf/item/2139064346 - untraceable

https://backpack.tf/profiles/76561197960443194#!/compare/1660780800/1661385600 - untrace

https://backpack.tf/profiles/76561198093248910#!/compare/1660089600/1661385600 - untrace

https://backpack.tf/item/12226985329

https://next.backpack.tf/profiles/76561199101711836/compare?from=1667606400&to=1667865600 - untrace

No other close compares on this history

Marketplace.tf

https://marketplace.tf/items/tf2/59;14 - 2 sales

Sep 10 2022: $239.99 / 1.94 = 123.7

Aug 7 2022: $199.99 / 1.96 = 102

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

SCM

https://steamcommunity.com/market/pricehistory/?country=US&currency=1&appid=440&market_hash_name=Collector%27s%20Dead%20Ringer - 5 sales

Sep 14 2022: $152.982 / 2.14 = 71.5

Sep 18 2022: $60.84 / 2.16 = 28.2

Sep 22 2022: $189.24 / 2.16 = 87.6

Dec 20 2022: $120 / 2.15 = 55.8

Dec 20 2022: $150 / 2.15 = 69.8

Mannco.store

https://mannco.store/item/440-collectors-dead-ringer - 1 sale

Sep 5 202: $175 / 1.76 = 99.4

Key prices: https://manic.tf/keyprice/?at=2022-09-05&site=mannco.store

Gladiator

https://gladiator.tf/sales?item=Collector%27s%20Dead%20Ringer&at=2022-12-23T02:25:59.093Z - 57.5 keys

https://gladiator.tf/sales?item=Collector%27s%20Dead%20Ringer&at=2022-10-20T21:26:07.389Z - 69.9 keys

https://gladiator.tf/sales?item=Collector%27s%20Dead%20Ringer&at=2022-11-20T21:26:07.389Z - 100 keys

Summary:

28.2

55.8

57.5

~buyers below here~

69.8

69.9

71.5

80

87.6

~sellers above here~~

99.4

100

102

123.7

Due to the wide tail ends, setting the range to the narrower band of 70-88.