Suggestion: Ghastly Ghosts Jr Brotherhood of Arms at 360–380 keys

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Sale 3) Sold + GE Phantom (60.5) for a Scorching Mining (167.5) + Burning Ponytail (160) + 61 Keys of Items + Frostbite Naggen (46) + 30 Keys

http://backpack.tf/profiles/76561198056793885?time=1442041200

http://backpack.tf/profiles/76561198056793885?time=1442300400

434.5 * 0.9 = ~391 Keys + 30 = 421 - 60.5 = 360.5 Keys which rounds to 361 Keys

Ponytail Mini

http://backpack.tf/vote/id/55db6337b98d8849218b457a - 170 Sale is still in-date (8/19 - 8/20)

http://www.tf2outpost.com/trade/27244161 - 1 Month Unsold for 150

Taking 160

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Sale 4) Sold for a Secret Modest (420) * 0.9 = 378 Keys

http://backpack.tf/profiles/76561198083783079?time=1447315200

http://backpack.tf/profiles/76561198083783079?time=1447401600

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206, 218, 361, 378

Since the ~200 Sales were longer ago, I'll use 360 - 380 (rounded)

The first sale is outdated, but since you aren't using it I guess it doesn't matter :P

All of the sales are now obsolete except for the last one. Maybe a range of 380-400 or just 380 flat would be better.

380 - 400?

You have one valid sale at 380. You could use my listed price for evidence (asking 400 keys pure or unusual overpay, no negotiation).

I cannot create a range using a Buyout.