4 month old price.

I sold mine along with a Hearts Capotain (2) and ~8.5 keys for a Scorching Head Warmer (9.8 with overpay), putting the Buto at 7.5. http://i.imgur.com/OR2xCPt.png

I bought mine for a Beams Mancer + Blizz Chieftan and he added 17 keys. http://i.imgur.com/qrfz16m.png http://i.imgur.com/jfq7qJr.png http://i.imgur.com/LwrfIdt.png http://i.imgur.com/ZOAfEIw.png (7 with overpay)

Some offers to help prove the range were:

Antifreeze Tree + 2 pure (7.7 with overpay - original suggestion was 6.3)

7.3 pure (discussed in steam chat, but you can see "sea salt" mention the offer on my trade - he lowered to 7 after a couple days of collecting the pure)

V. Service Medal (7.2 with overpay, on my trade)

PE Tyrolean (had a 7 pure c/o)

More stuff that bp.tf hasn't priced but would get 7+

The others on the market aren't getting nearly as many offers as I did, but here's one more:

http://www.tf2outpost.com/trade/13994903 - offered Scorching Shako + 2 buds (6.8 with overpay)

Low range is 7 for the lowest sale, high is 7.5 for the highest sale.