Proof below. 3 month-old price.

Sales:

http://www.tf2outpost.com/trade/14877337

-wanted 17 keys

-seems to have sold for nnb sam (outdated): http://www.tf2outpost.com/trade/14895559

-~16 keys then

http://www.tf2outpost.com/trade/14849466

-nnb cosa seems to have bought this logo handle

-cosa: http://www.tf2outpost.com/item/440,1985284562,459,5

-14 keys then

http://www.tf2outpost.com/trade/14869287

-sold for 1 bud=~19 keys then, outlier

http://www.tf2outpost.com/trade/14815552

-polar wanted 1 bud (19 keys then) on another trade

-sold for gifted bud+1 key

-later sold his gifted bud for 16 keys: http://www.tf2outpost.com/trade/14816198

-17 keys

Current trades:

http://www.tf2outpost.com/trade/15957589

-b/o of 16 keys, 1 week (he's had the hat for a while longer)

-no offers

http://www.tf2outpost.com/trade/13094215

-b/o of 18 keys (owner was away for most of the time)

-recent notable offers:

14 keys+v. fedora=16 keys at the time

nnb whoopee=16 keys at the time

nnb baker (never properly priced)=14

someone wanting to buy? (Doesn't have keys)

http://www.tf2outpost.com/trade/12485646

-another old trade

-recent notable offers:

bud if he adds 7 keys=14 keys then

stormy copper's hard top=14 keys

Sales: 14, 16, 17, 19

I think the range here could be either 14-16 or 14-17 but I prefer to go with the range from sales and there's not much of a difference anyway. Unusual overpay and original prices used.