This needs a slight bump down. Proof below:

Offers:

Have a B/O of 1 bud or 27 keys:

http://www.tf2outpost.com/trade/9688073 (1 day, no notable offers yet)

Offering the crown + 1 key for 1 bud:

http://www.tf2outpost.com/trade/9720990 (which puts the crown around 25-26 keys)

Being offered a steaming Tam O' Shanter + 2 keys:

http://www.tf2outpost.com/trade/9456787 (approx 25 keys, 1 week trade, same seller as link 2)

Being offered 1 bud:

http://www.tf2outpost.com/trade/9362104 (retracted because seller sold off the buds or bought something else)

B/O of 1.33 buds:

http://www.tf2outpost.com/trade/9554587 (6 days, no offer)

Quicksale of 16 keys:

http://www.tf2outpost.com/trade/9687209 (4 views, immediately bought by seller in first link)

Lower range is determined through the steaming Tam O' Shanter + 2 keys offer (overpay in unusual)