Available Histories (there may be others but these are the ones used in previous suggestions or are being sold at the moment)

1. https://backpack.tf/item/4846943069 Not traded last 2 years

2. https://backpack.tf/item/6221645103 Not traded (at least since histories were lost a few years ago)

3. https://backpack.tf/profiles/76561198232041512#!/compare/1569888000/1569974400 - this one lost in someones backpack

4. https://backpack.tf/item/5362905906 Not traded (at least since histories were lost a few years ago)

5. https://backpack.tf/item/11551514311 Not traded for a year

6. https://backpack.tf/item/5828881985 Not traded for a year

7. https://backpack.tf/item/8287694720 traded 4 months ago - Out of date - not easy to understand what was traded

https://backpack.tf/profiles/76561198064104470#!/compare/1723420800/1723593600

https://backpack.tf/profiles/76561198342161127#!/compare/1723420800/1723593600

8. https://backpack.tf/item/5038088607 Overpay in unusuals - unsure how to value this as no matter how you look at it significant overpay was involved.

https://backpack.tf/profiles/76561198063640894#!/compare/1733011200/1073309760

https://backpack.tf/profiles/76561198046588996#!/compare/1730505600/1733184000

9. https://backpack.tf/item/15197898345 Paid 340 keys pure

https://backpack.tf/profiles/76561198008793871#!/compare/1733788800/1733961600

https://backpack.tf/profiles/76561198115457736#!/compare/1733875200/1733961600

Note missing keys from seller's Backpack were used to buy Chad's Scorching Flames Tundra Top (paid 190 keys) on same day

https://backpack.tf/profiles/76561198860735519#!/compare/1733875200/1733961600

Current buy order for Scorching heralds helm is 285 and lowest seller at 400.

For what its worth buy orders for burning Herald's Helm at 355 & the two effects across all unusuals generally track pretty close to each other.

Suggesting 340 flat as only clean sale and seems reasonable given buyers & sellers.

Happy to amend if other sales pop up.