Props to mushroom knight and ♫ I ate all your candy ♫ for some of this proof and making a range more clear. 2 days after Baloo's suggestion and they've steadily dropped again below the market, needs another steady drop. In his suggestion you can see he was contemplating bringing 7 in his range, so 7-8 would have probably also been valid if he actually did any link surfing.

Proof

Unsold:

http://www.tf2outpost.com/trade/14419172 6 keys, taken down multiple times, unsold

http://www.tf2outpost.com/trade/14424315 Adding a key for s. mantreads (1) + s. disc action (6, can get them for 5 easily but still) = unsold at 6 keys

http://www.tf2outpost.com/trade/14414746 looking for a ts bills, appears to have an add

http://www.tf2outpost.com/trade/14408792 6 keys 2 ref, unbumped 12 hrs

http://www.tf2outpost.com/trade/14422807 2 at 6 keys 3 ref

http://www.tf2outpost.com/trade/14419144 6 keys 3 ref

http://www.tf2outpost.com/trade/14423387 Was selling at 6, http://www.tf2outpost.com/trade/14423425 Now selling at 7

http://www.tf2outpost.com/trade/14391414 7 keys for a day

http://www.tf2outpost.com/trade/14409948 7 keys for 13 hours

http://www.tf2outpost.com/trade/14329442 Lowered from 8 to 7, unsold for 4 days w/ autobump

http://www.tf2outpost.com/trade/14397186 2 unsold at 7 for a day, appears to have been lowered

http://www.tf2outpost.com/trade/14423228 7 keys

http://backpack.tf/classifieds/search/id/521e98a2ba253678488b456b Most of the recent ones are being listed at 6-7

Sold:

http://www.tf2outpost.com/trade/14423926 6 keys

http://www.tf2outpost.com/trade/14398181 6 keys (would normally say this is somewhat of a quickbuy trade, but he bought 1 in 3 hours. http://www.tf2outpost.com/trade/14403413 now trying to get 8 keys lol)

http://www.tf2outpost.com/trade/14382106 6 keys

http://www.tf2outpost.com/trade/14423387 6 keys

http://www.tf2outpost.com/trade/14407161 6 keys 1 ref

http://www.tf2outpost.com/trade/14394443 6 keys 3 ref

http://www.tf2outpost.com/trade/14411576 7 keys

http://bazaar.tf/trade/425077 7 keys

http://www.tf2outpost.com/trade/14355816 7 keys, offline :>

http://www.tf2outpost.com/trade/14408758 bought for 7 keys 2 ref or less, http://www.tf2outpost.com/trade/14414988 trying to sell for 8 keys lol

Conclusion:

The crate 60s are tanking, and the stranges are no exception, as can easily be seen from sales/unsolds right now, needs a bump down to reflect the market.