85 keys is seemingly high, but in hindsight, the two sales for 50 and 58.5, the lower end of the spectrum, occurred in November. It could be that an accurate price using December-January would be higher, possibly 60-85 keys. It would all depend on what happens with the current sellers.
Got mine for a pro pumpkin bomb aussie rl + about 5-10 keys in sweets for a spelled pro ks one, so im guessing the spells kinda cancel each other out and that comes out to right around 60 which is in the middle of your range.
I bought this for 70 keys on December 7, 2018. Keys were worth 1 key then, equaling 70 keys, rounding to 70 keys. Taking 70 keys.
https://backpack.tf/profiles/76561198064658655#!/compare/1544140800/1544313600
I don't know how to use backpack.tf compare but this is the best I found. Screenshot https://i.imgur.com/YD9Acpl.png
https://backpack.tf/profiles/76561198079821428#!/compare/1542758400/1542844800
Bulk trade
https://backpack.tf/profiles/76561198079873281#!/compare/1547078400/1547164800
Swap between alts?
https://steamcommunity.com/market/listings/440/Strange%20Collector%27s%20Professional%20Killstreak%20Cow%20Mangler%205000
November 25 - $130.45 = 58.5
December 18 - $67.15 = 31
January 5 - $138.00 = 60
https://marketplace.tf/items/441;14;kt-3
November 5 - $89.99 = 50
Current sellers:
https://backpack.tf/classifieds?item=Cow+Mangler+5000&quality=14&tradable=1&craftable=1&australium=-1
Two for 150 keys each
https://steamcommunity.com/market/listings/440/Strange%20Collector%27s%20Professional%20Killstreak%20Cow%20Mangler%205000
One seller for $229.16 - Approximately 115 keys
//
Sales: 31, 50, 58.5, 60, 70
Sellers: 115, 150, 150
31 is clearly the outlier because quickbuyers are buying for 28 keys. Going with 50-70.
Keys were worth 1 key then, equaling 70 keys, rounding to 70 keys. Taking 70 keys.
Woah...who knew
https://marketplace.tf/items/441;14;kt-1
Current seller for $70 on marketplace.
This would be around 40 keys.
Depending on how fast this sells, I think that 50-70 is still the correct price for this item.
If it quick sells, I'm staying with 50-70. If it stays for a while, then I'll be a lost boy.
seems to have been removed
Updates:
https://marketplace.tf/items/441;14;strange;kt-3
January 10, 2019 - Sold for $150.00 = 86 keys
https://marketplace.tf/items/441;14;kt-1
Previous seller for $70 is gone, but did not sell on marketplace.tf
//
https://marketplace.tf/items/441;14;strange;kt-3
Current seller for $249.90, about 140 keys
https://backpack.tf/classifieds?item=Cow+Mangler+5000&quality=14&tradable=1&craftable=1&australium=-1
Classifieds has more sellers, most notably a seller for 60 keys https://i.imgur.com/rHQ8dOg.png
85 keys is seemingly high, but in hindsight, the two sales for 50 and 58.5, the lower end of the spectrum, occurred in November. It could be that an accurate price using December-January would be higher, possibly 60-85 keys. It would all depend on what happens with the current sellers.
Updates
https://backpack.tf/profiles/76561198162120088#!/compare/1548288000/1548547200
https://backpack.tf/profiles/76561198075991823#!/compare/1548374400/1548460800
Sold for 50 keys
Previously was selling on classifieds for 60 keys
Update:
https://marketplace.tf/items/441;14;strange;kt-3/Professional%20Collector's%20Strange%20Cow%20Mangler%205000
https://gyazo.com/fa14a0b7fcbca881689b59f96b317e4c
Recent sale for $175.00, equaling to 98 keys
Got mine for a pro pumpkin bomb aussie rl + about 5-10 keys in sweets for a spelled pro ks one, so im guessing the spells kinda cancel each other out and that comes out to right around 60 which is in the middle of your range.