Had to check with mods about what to do with the Yellow Belt. Realized I shouldn't have closed my past suggestion.

http://backpack.tf/item/3147489446

Sale) Sold for a Nebula Space Mann (850 Keys) + Frostbite Crown of the Old Kingdom (300 Keys) + Duped Sunbeams Pyromancer's Mask (173 Keys)

http://backpack.tf/profiles/76561198001812215#!/compare/1496966400/1497052800

There's no Mini for the Crown, so I'll use its 4 Month price of 300 Keys.

850 + 300 + 173 = 1323, which I'll round to 1325 Keys

Pyromancer's Mini

http://backpack.tf/profiles/76561198220702228#!/compare/1488672000/1489449600 - Sold + 1 Key for a Harvest Moon Dr's Dapper Topper (174 Keys)

http://backpack.tf/profiles/76561198140010255#!/compare/1489363200/1489622400 - Buyer's Backpack

http://backpack.tf/profiles/76561198140010255#!/compare/1492214400/1492560000 - Quicksold for 125 Keys

http://backpack.tf/profiles/76561198053700606#!/compare/1496620800/1496707200 - Sold for a Demonflame Master's Yellow Belt + 45 Keys

With the Yellow Belt: there are sales at 120 pure (quicksold), the one with the Pyromancer's, and 200 pure.

I can't use the Pyromancer's - Belt sale for the Pyromancer's because that's too high (clean Unsold at 179 Keys).

I also can't use that to price the Belt because then I'll have sales at 128 and 200. So, I'll ignore it entirely.

https://backpack.tf/suggestion/593dd108e338770842400f2c - Old suggestion for Mod reference for the 1-Month rule