Counter to the other suggestion because:

* Duped DBD Gibus is not worth 16 (We can't price one single unusual if multiple were used to buy 1 big one, found another sale)

* DBD Modest is not an outlier (The sale was valued the same as gibus)

* There was a B\O off 12 which the other suggestor ignored.

0 on market, not for sale. 2 usable sales within 3 months.

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*1 http://www.tf2outpost.com/trade/21936795 - B\O 12

http://backpack.tf/profiles/76561198039360813?time=1408086000 -> http://backpack.tf/profiles/76561198039360813?time=1408172400

Sold together with 1 bud for DBD Modest (Mini at the bottom, worth ~12)

0.9(12-1) = ~10

*2 http://www.tf2outpost.com/trade/22007490 - Sold for Duped Disco Gibus (Mini at the bottom, worth ~11)

11 (No overpay because offered)

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Mini on modest (Only 1 recent sale):

http://www.tf2outpost.com/trade/21590426 -> Sold for Ghosts Hallmark (5) + 39 keys (2.3) + P.E Phantom (I think we can all agree that this is ~6 even though it's outdated, no one is selling below 6 and it's recieving offers around 6)

13.3 * 0.9 = ~12

B\O's are ~12 aswell

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Mini on duped Disco Gibus (2 recent sales, 1 being in a big trade for a disco captain):

http://www.tf2outpost.com/trade/22212041 - Tried quickselling at 11 pure for 3 weeks

http://www.tf2outpost.com/trade/22593339 - Got offered Aces BOA (9.5*0.9=8.5) + Aussie Medi gun (Professional, ~2) + S.F Ubersaw (Professional, ~7 keys) + sweets which should be around 11

So it's safe to say that it can get 11 with some time but it also proves that 11 is no quicksale.

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Conclusion: We have 1 B\O at 12 and 2 sales at ~10 aswell, therefore the price at 10.