clean: https://backpack.tf/item/10390117478

https://backpack.tf/profiles/76561198135388328#!/compare/1627603200/1627689600

https://backpack.tf/profiles/76561199111292616#!/compare/1627516800/1627689600

can't determine, however

a handy gladiator sales snapshot from the past month suggests

https://gladiator.tf/sales?item=Orbiting%20Fire%20Backbiter%27s%20Billycock&at=2021-09-23T14:28:31.431Z

a buy at 1 @ 16 keys 7.33 ref

and a sale at 1 @ 17 keys 5 ref

https://backpack.tf/profiles/76561199111292616#!/compare/1631145600/1631232000

I'll take those as is.

https://backpack.tf/profiles/76561198188137053#!/compare/1586217600/1632528000

https://gladiator.tf/listings/614e96072455189adc082dbf

untrace, but snapshot suggests buy order for ~17k

current gladiator snapshot shows https://gladiator.tf/sales?item=Orbiting%20Fire%20Backbiter%27s%20Billycock&at=2021-10-23T14:32:43.817Z

1 @ 17 keys 30 ref

most likely from this dupe history https://backpack.tf/item/452782501, which would round up to ~18k

Although there are more sales from the dupe history above, classies suggest that anything outside of the 17-18k range (given the 17.5k seller and ~17k buyers) would be countered.

So just taking 17-18k here given available sales.