Price is 1 year old

Bot.tf sales:

No KS: https://imgur.com/vDR1cLM

1 bought at 5 keys 30 ref, 5.69 keys 5.7

Specialized KS: https://imgur.com/xpRxZch

1 sold at 7 keys

Marketplace.tf sales (past month)

No KS: https://marketplace.tf/items/tf2/36;14

September 30 2020: $14.48 (key=$1.83, 7.91 keys) ~7.9 keys

Going with 5.7-7.9 keys

Oops, I forgot to include SCM sales:

SCM sales (taking past month):

Basic KS: https://steamcommunity.com/market/listings/440/Collector%27s%20Killstreak%20Blutsauger

September 28 2020 @ 2 AM: $7.70 (key=$2.33, 3.30 keys) ~3.3 keys

Spec KS: https://steamcommunity.com/market/listings/440/Collector%27s%20Specialized%20Killstreak%20Blutsauger

September 3 2020 @ 10 PM: $9.54 (key=$2.33, 4.09 keys) ~4.1 keys

September 25 2020 @ 12 AM: $37.17 (key=$2.31, 15.68 keys) ~15.7 keys

Buyers at 5.69 counter 4.1 and 3.3, sellers at 12 counter 15 which is a spec KS anyway, probably sold for more because it's a spec KS, I think the suggested range should be fine