Couldn't sell it for 1 key + 6 ref(1.85 keys) for two weeks. Dropped it down to 1 key + 5 ref and only managed to sell it in 3 days. This calls for a conservative drop.

Sellers for less than 1.85 keys.

http://www.tf2outpost.com/trade/18573389 - 1 key + 3 ref

http://www.tf2outpost.com/trade/18155812 - 1 key + 5 ref(21 days old on autobump, wow)

http://www.tf2outpost.com/trade/18473587 - 1.8 keys sold.

http://www.tf2outpost.com/trade/18546063 - 1 key + 4 ref, painted.

http://www.tf2outpost.com/trade/18570863 - 1 key + 5 ref

http://www.tf2outpost.com/trade/18562757 - 1 key + 5 ref

http://www.tf2outpost.com/trade/18538731 - 1.5 keys, painted.

http://www.tf2outpost.com/trade/18513030 - 1 key + 5 ref.

http://www.tf2outpost.com/trade/18508170 - 13 ref, painted.(slightly below 1.85 keys)

http://www.tf2outpost.com/trade/18562073 - 1 key + 5 ref

http://backpack.tf/stats/Unique/All-Father/Tradable/Craftable - Out of 10 listed in bptf, NONE are selling for 1.85 keys, all are LOWER, and they even include paints. Check it out youself, cheapest even goes for 11 ref, which is whopping 1.55 keys.

Unsolds for Bp.tf Price(1.85 keys)

http://www.tf2outpost.com/trade/18347757 - 12 days, painted, auto bump.

http://www.tf2outpost.com/trade/17706947 - 1month2days, painted, auto bump.

http://www.tf2outpost.com/trade/18427346 - 1week, auto bump.

http://www.tf2outpost.com/trade/18518378 - 3 days, painted, auto bump.

http://www.tf2outpost.com/trade/17975852 - 1 month, auto bump.

http://www.tf2outpost.com/trade/18510393 - 4 days, auto bump.

http://www.tf2outpost.com/trade/18444330 - 1 week.

http://www.tf2outpost.com/trade/18539247 - 2 days, auto bump.

http://www.tf2outpost.com/trade/18540871 - 2 days, auto bump.

http://www.tf2outpost.com/trade/18335701 - 12 days, auto bump.

http://www.tf2outpost.com/trade/18452077 - 6 days, auto bump, dropped to 1 key+5 ref now.

http://www.tf2outpost.com/trade/18534960 - 2 days, auto bump.

Therefore I suggest this drop.

1.7 keys = 1 key + 5 ref.

1.85 keys = 1 key + 6 ref(Currently Priced).

Also, do take note, I personally own one myself. It is against my favour, therefore there is no bias involved.