Resuggesting.

Seems to get some offers at around 15 keys but should not really be higher than 17.

http://www.tf2outpost.com/trade/15116178

Sold it for steaming pug (11 keys) plus 6.5 keys (17.5 keys together)

http://www.tf2outpost.com/trade/14443734

Best offer in one month is Nuts Dragon + merc pride (15 keys with overpay), BO is at 21 keys

http://www.tf2outpost.com/trade/14893095

Had this trade up for a week at 17 keys pure, no buyers, then put up http://www.tf2outpost.com/trade/15083262 which lists it at 16 keys, still no buyers in 2 days, has max bumps

http://www.tf2outpost.com/trade/15028078

BO at 18 keys, 5 days old

http://www.tf2outpost.com/trade/15007784

BO at 17 keys, 5 days old and frequently bumped

http://www.tf2outpost.com/trade/14585693

Offered about 16 keys in items/mix, rejected, relatively old offer, no other offers

And there's about 8 others on the market with no offers in a long, long time.