The Old Fella

http://backpack.tf/item/467999838

Sale 1) Sold for a G. Fetti Tree (23) + Peace Sign Letch's (16.5) + 5 Keys + ~4 Keys in Items

http://backpack.tf/profiles/76561198053946887?time=1439535600&compare=1439708400

20.5 * 0.9 = ~18 + 28 = 46 Keys

Tree Mini

http://backpack.tf/profiles/76561198215629700?time=1442041200&compare=1442127600 --- 23 Keys

Sale 2) Sold for 37 Keys

http://backpack.tf/profiles/76561198064202133?time=1442905200&compare=1443078000

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As a Side Note

While 37 was a Quicksell, 46 Flat seems too high since there are other sales for less than 37. Such as...

http://backpack.tf/profiles/76561198058065132?time=1443337200&compare=1443510000 --- Sold for a Ghosts Bonk (35.5)

http://backpack.tf/profiles/76561198111273937?time=1438326000&compare=1438412400 --- Sold for 35 Keys