This is such a pain, Why are there so many? .-. (Note there is also a strangifier for this at 3 refined, so Gonna use strange sales here as well)

Sale 1: Sold for $33 Taking 16

https://marketplace.tf/items/388;5;u29

Sale 2: Sold for a Disco Beatdown Airdog (20 Indate) + 1 item that rounds to a key.

B:O Of 20 http://www.tf2outpost.com/trade/28860397

https://backpack.tf/profiles/76561198115721685#!/compare/1495497600/1495929600

https://backpack.tf/profiles/76561198016007274#!/compare/1495756800/1498953600

Sale 3: Way too large to tell when (SCM)

https://backpack.tf/profiles/76561198284241715#!/compare/1499990400/1501200000

Sale 4: Bulk

https://backpack.tf/profiles/76561198284241715#!/compare/1502582400/1502668800

https://backpack.tf/profiles/76561198182567266#!/compare/1501977600/1502582400

History: https://backpack.tf/item/599593820

Sale 5: Too large of a gap

https://backpack.tf/profiles/76561198057108804#!/compare/1496188800/1496620800

Sale 6: Sold along with a key in sweats for a Orb.Fire Milkman (16) Taking 17 (3 Days)

https://backpack.tf/profiles/76561198192531745#!/compare/1499558400/1499731200

https://backpack.tf/profiles/76561198036952830#!/compare/1499558400/1499731200

Sale 7: Sold with a key in items for a P.Fetti Thirst Blood (16 In Date) Took 1 Day)

https://backpack.tf/profiles/76561198192531745#!/compare/1499731200/1499817600

https://backpack.tf/profiles/76561197996095002#!/compare/1499731200/1499817600

History: https://backpack.tf/item/801713560

Sale 8: May have sold for a Max's Head though probably not, (Not Using this)

https://backpack.tf/profiles/76561198218586212#!/compare/1496707200/1496793600

History: https://backpack.tf/item/1102819561

Sale 9: Sold for 16 keys after a day

https://backpack.tf/profiles/76561198011047365#!/compare/1496188800/1496275200

https://backpack.tf/profiles/76561198242124526#!/compare/1496275200/1496534400

Sale 10: Sorta bulkish that leads to 11 keys though the modest is outdated

https://backpack.tf/profiles/76561198084337071#!/compare/1500249600/1500422400

Sale 11: QS For 14 keys? Took 2 days

https://backpack.tf/profiles/76561198118921483#!/compare/1500336000/1500422400

Sale 12: Sold for a Orb Fire Swagman's Swatter (15.5) + 1 Key Rounding to 17

https://backpack.tf/profiles/76561198118921483#!/compare/1500854400/1500940800

History: https://backpack.tf/item/1093003522

Sale 13: Sold along with 3 keys in items for a Circling TF Logo Pom-Pommed Provocateur, Better to use on the Pom-Pom

https://backpack.tf/profiles/76561198204768007#!/compare/1500336000/1500422400

History: https://backpack.tf/item/1539488037

Sale 14: Sold with 4 keys in items for a Circling Peace Sign Whirly Warrior, Using on the warrior

https://backpack.tf/profiles/76561198059212669#!/compare/1500076800/1500249600

https://backpack.tf/profiles/76561198166148685#!/compare/1500163200/1500249600

History: https://backpack.tf/item/2855728486

Sale 15: bulk

https://backpack.tf/profiles/76561198084130751#!/compare/1500508800/1500681600

History: https://backpack.tf/item/4921130184

Sale 16: Something

https://backpack.tf/profiles/76561198074383177#!/compare/1501200000/1502064000

https://backpack.tf/profiles/76561198002186909#!/compare/1502064000/1502150400

History: https://backpack.tf/item/3785764326

Sale 17: Sold for 14 Keys May have been a QS

https://backpack.tf/profiles/76561198126937582#!/compare/1498780800/1500595200

Sale 18: Maybe QS For 13 Keys?

https://backpack.tf/profiles/76561198262422109#!/compare/1500336000/1500422400

History: https://backpack.tf/item/5839723608

Sale 19: Bulk

https://backpack.tf/profiles/76561198095022965#!/compare/1496016000/1496188800

https://backpack.tf/profiles/76561198159546315#!/compare/1496102400/1496188800

Sale 20: Sold for a Smoking Nostra Cosa Cap (14.5) Taking 15

https://backpack.tf/profiles/76561198209842284#!/compare/1496534400/1496793600

Sale 21: Sold for 14 Keys (Took 2 Days)

https://backpack.tf/profiles/76561198209842284#!/compare/1498348800/1498435200

Sale 22: Sold for a Miami Nights Rimmed Raincatcher (13 Keys) + 14 Refined as a item, Taking 14? (2 Days)

https://backpack.tf/profiles/76561198030715720#!/compare/1498608000/1498694400

https://backpack.tf/profiles/76561198107520045#!/compare/1498608000/1498694400

Sale 23: Sold along with a Pro KS Australium Blutsauger (Sellers at 8) + 2 Keys for a Orb.Fire Towering Pillar of Hats (Barely indate at 24) 1 Month, no Outpost

24 - 10 = 14

https://backpack.tf/profiles/76561198072823135#!/compare/1501718400/1501804800

History: https://backpack.tf/item/2929695036

Swagman Mini: https://backpack.tf/suggestion/59919796cf6c7561463a0e12

Total Sales:

11

13

14 (x5)

15

16 (x2)

17 (x2)

20

Unsolds:

3 Young Sellers all at 17

Year Old at 20? http://www.tf2outpost.com/trade/28358302

Thanks for jarool for the help

Gonna go with 14-17 seeing how 14 sells a lot more than any other point