Resuggestion based on the feedback of my previous suggestion.

There are 2 in existence of this hat, the other one[url] hasn't moved in 5 years.

Item history: [url=https://backpack.tf/item/3339540509]https://backpack.tf/item/3339540509

Sale #1: 110 keys in items: Cirlcling Heart Brotherhood of Arms (79 keys) + Spectral Spectrum B.M.O.C. (20 keys) + Exorcism Strange Spec. Ks. Scattergun (5 keys) + Exorcism Strange Spec. Ks. Eyelander (6-7 keys)

https://backpack.tf/profiles/76561198025018960#!/compare/1635033600/1635379200

https://backpack.tf/profiles/76561198984595114#!/compare/1635120000/1635465600

Mini suggestions for Sale #1:

Circling Heart Brotherhood of Arms: ~79 keys

Classifieds: Sell orders at 77.48-88.65 keys, buy orders at 62.12 keys

https://backpack.tf/stats/Unusual/Brotherhood%20of%20Arms/Tradable/Craftable/19

3 sales for $175.99 (96.16 keys) on marketplace.tf (10.15 - 12.17), currently one listed at $155.56 (85 keys)

https://marketplace.tf/items/tf2/30066;5;u19

1 sale for $110.59 (68.69 keys) on mannco.store (12.21), currently one listed at $159.99 (99.36 keys)

https://mannco.store/item/440-circling-heart-unusual-brotherhood-of-arms

Currently one listed for €194.99 (100 keys)

https://steamcommunity.com/market/listings/440/Unusual%20Brotherhood%20of%20Arms?filter=circling+

Sale #1 (12.12): 93 keys 4 ref pure

https://backpack.tf/profiles/76561198069707880#!/compare/1639267200/1639353600

https://backpack.tf/profiles/76561198072062749#!/compare/1639267200/1639353600

Sale #2 (01.08): 61 keys 58.77 ref pure

https://backpack.tf/profiles/76561198151417403#!/compare/1641513600/1642032000

https://backpack.tf/profiles/76561198069707880#!/compare/1641600000/1641686400

Spectral Spectrum The B.M.O.C.: ~20 keys

Sale #1 (09.27): 21 keys (a bit old)

https://backpack.tf/profiles/76561199022830960#!/compare/1632355200/1632700800

https://backpack.tf/profiles/76561198062269496#!/compare/1632614400/1632700800

Sale #2 (11.28): 21 keys pure

https://backpack.tf/profiles/76561198070866395#!/compare/1637971200/1638057600

https://backpack.tf/profiles/76561198105471167#!/compare/1638057600/1638144000

Sale #3 (11.29): 24 keys (1:1 trade for Non-Craftable Summer Hat)

https://backpack.tf/profiles/76561198049651680#!/compare/1637712000/1638316800

https://backpack.tf/profiles/76561198241082898#!/compare/1638144000/1638316800

Sale #4 (11.30): 22 keys (couldn't match with buyer's backpack but using it due to the lack of recent sales)

https://backpack.tf/profiles/76561198062269496#!/compare/1638230400/1638403200

https://backpack.tf/profiles/76561198880665077#!/compare/1637884800/1640649600

Sale #5 (12.21): ~30 keys in items (Max's Severed Head + sweets) (Duped!)

https://backpack.tf/profiles/76561198168563614#!/compare/1639958400/1640044800

https://backpack.tf/profiles/76561198154315430#!/compare/1639785600/1640044800

Sale #6 (01.03): 16 keys pure (Duped!)

https://backpack.tf/profiles/76561198154315430#!/compare/1640908800/1641168000

https://backpack.tf/profiles/76561199124454687#!/compare/1640995200/1641168000

Sale #7 (01.05): 16 keys pure (Duped!)

https://backpack.tf/profiles/76561199124454687#!/compare/1641254400/1641340800

https://backpack.tf/profiles/76561198868058365#!/compare/1641254400/1641340800

Current Classified listings: 20 keys and up

https://backpack.tf/classifieds?item=B.M.O.C.&quality=6&tradable=1&craftable=1&australium=-1&killstreak_tier=0&spell=Spectral%20Spectrum

Current SCM listings: €45.6 (23.63 keys)

https://steamcommunity.com/market/listings/440/The%20B.M.O.C.?filter=spectral

Exorcism Strange Spec. Ks. Eyelander: ~6-7 keys

Sale #1 (09.22): 15 keys pure (Not sure to include this one as it is older than 4 months, but at the time of the original trade it was relevant. However it could be argued that the price was inflated due to the upcoming halloween event)

https://backpack.tf/profiles/76561198179597498#!/compare/1632268800/1632355200

https://backpack.tf/profiles/76561198984595114#!/compare/1632268800/1632355200

Sale #2 (12.05): 7 keys pure

https://backpack.tf/profiles/76561198144430577#!/compare/1638403200/1638748800

https://backpack.tf/profiles/76561199025532129#!/compare/1638662400/1638748800

Sale #3 (01.09): 4.5 keys mix

https://backpack.tf/profiles/76561198881129658#!/compare/1641600000/1641686400

https://backpack.tf/profiles/76561198240811422#!/compare/1641686400/1641859200

Current classified listings: 6-9 keys

https://backpack.tf/classifieds?item=Eyelander&quality=11&tradable=1&craftable=1&australium=-1&killstreak_tier=2&spell=Exorcism

Current mannco.store listing: $9.6 (5.96 keys)

https://mannco.store/item/440-strange-specialized-killstreak-eyelander

Current SCM listings: €17.25 (8.94 keys)

https://steamcommunity.com/market/search?appid=440&q

Exorcism Strange Spec. Ks. Scattergun: ~5 keys (Even though I did not find many recent sales, I'm going with my original estimation based on the current market. Even if I'm a few keys wrong on this one, it should not influence the total value of the original trade)

Sale #1 (12.04): 5 keys pure (Duped!)

https://backpack.tf/profiles/76561198122387677#!/compare/1638316800/1638748800

https://backpack.tf/profiles/76561198081270328#!/compare/1638576000/1638662400

Current classified listings: 5-7 keys

https://backpack.tf/classifieds?item=Scattergun&quality=11&tradable=1&craftable=1&australium=-1&killstreak_tier=2&spell=Exorcism

Current marketplace.tf listings: $13.99 (7.64 keys)

https://marketplace.tf/items/tf2/200;11;kt-2

Current SCM listings: €13.86 (7.18 keys)

Sale #2: ~100 keys in items: Duped Exorcism Prof. Ks. Australium Rocket Launcher (Team Shine + Cerebral Discharge)

https://backpack.tf/profiles/76561198984595114#!/compare/1635465600/1635984000

https://backpack.tf/profiles/76561198292137994#!/compare/1635465600/1635552000

Mini suggestion for Sale #2:

Exorcism Prof. Ks. Australium Rocket Launcher (duped): ~100 keys (the value of this item also depends on the killstreak sheen and effect)

Sale #1 (12.31): 90 keys pure

https://backpack.tf/profiles/76561198063640894#!/compare/1640736000/1640908800

https://backpack.tf/profiles/76561199196245596#!/compare/1640649600/1641081600

I could only find 2 other recent sales, both of in which it was paid for with items (including spells and unusuals) which would need further "mini-suggestions", therefore I only just did a vague estimation of the potential value of the full trades

Sale #2 (12.01): ~105 keys

https://backpack.tf/profiles/76561198984595114#!/compare/1637107200/1638316800

https://backpack.tf/profiles/76561198120774019#!/compare/1638230400/1638316800

Catastrophic Companions: 68 keys

Strange Bruiser's Bandanna: 6 keys

Strange Kill-a-Watt Rebel Rouser: ~20 keys

Double Spelled Spec. Ks. Festive Rocket Launcher: ~10 keys

Sale #3 (01.17): ~111 keys

https://backpack.tf/profiles/76561198120774019#!/compare/1642377600/1642464000

https://backpack.tf/profiles/76561198075998447#!/compare/1642377600/1642464000

Exorcism Prof. Ks. Blood Botkiller Rocket Launcher: 32 keys (currently being listed on classifieds)

Isotope Skull Cracked Rocket Launcher (Field-Tested): $80 (49keys) (currently being listed on mannco.store)

Haunted Ghosts Wet Works: 30 keys

Current classified listings: 95 keys and up

https://backpack.tf/classifieds?item=Rocket%20Launcher&quality=11&tradable=1&craftable=1&australium=1&killstreak_tier=3&spell=Exorcism

Current SCM listings: €253.15 (131.2 keys) (Team Shine + Flames)

https://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Australium%20Rocket%20Launcher?filter=exorcism

Sale #3: 100 keys pure

https://backpack.tf/profiles/76561199101711836#!/compare/1637539200/1637625600

https://backpack.tf/profiles/76561198043501673#!/compare/1637625600/1637712000