Did some searching; its pretty damn hard to find proper sales on a clean beams honcho as it turns out.

I also found out that there has been another sale, which should be taken into account as well

Working it out I get this

Sale 1:

sold for 60 pure:

http://www.tf2outpost.com/trade/25413136 [relisted a couple of times]

http://backpack.tf/profiles/76561198078784681?time=1427149485 before

http://backpack.tf/profiles/76561198078784681?time=1427180400 after

-> 60 keys

Sale 2:

Sold + 18 keys for a beams honcho (90)

http://www.tf2outpost.com/trade/25484100

http://backpack.tf/profiles/76561198048754056?time=1431586800 before

http://backpack.tf/profile/76561198048754056?time=14316732000 after

http://i.imgur.com/e1Dsv9g.png

Mini honcho has accounted for overpay

93-18 = ~ 75

-> 75 keys

Mini beams honcho:

- Seems to have sold for dirty max (~28.5) + 2 buds (16) + 34 keys + sweets (~3) (B/O 9 buds, was cashing out) [ (~68) pretty sure this is an outlier]

- Sold for miami bomber (74) + 2 buds (25) + 1 key

http://www.tf2outpost.com/trade/25092422

http://backpack.tf/profiles/76561198108604988?time=1424332800 before

http://backpack.tf/profiles/76561198108604988?time=1424419200 after

0.9*74 + 25 + 1 = ~93

Taking 93 after overpay

You can do some more research on the beams honcho if you like, but with this, id guess a range of 60-75 would be more suitable.

~Hope this helps