Dropping Jarool's hats is not a good idea but I hate 1st/2nd/3rd gen Translator's with a passion so I looked at this

Stormy Storm Universal Translator

Sale 1

Sold for a Strange Kill-A-Watt Sky High Fly Guy (indate at 21 keys) + 5 keys = 26 keys

https://backpack.tf/profiles/76561198053717045#!/compare/1531094400/1531267200

Buyers side traded too quickly

Sale 2

Sold for a Dead Presidents Translator (16 keys) and 3 keys = 19 keys

https://backpack.tf/profiles/76561198282977026#!/compare/1530144000/1531267200

https://backpack.tf/profiles/76561198118235963#!/compare/1531180800/1531267200

Mini for the DP Transi:

Sold with a key for a Blizzy Reggaelator (16.5 keys) = 16 keys

https://backpack.tf/profiles/76561198282977026#!/compare/1531267200/1531353600

(Buyer traded too quickly)

Sale 3

Sold for a Kill-A-Watt Hermes (22 keys, freshly priced)

https://backpack.tf/profiles/76561198118235963#!/compare/1531353600/1531440000

https://backpack.tf/profiles/76561198148149691#!/compare/1531353600/1531440000

Sale 4

Sold with a Disco Beat Down Toy Tailor (16 keys) for an Eerie Orbiting Fire Honcho's Headgear (30 keys) + 6 keys = 20 keys

https://backpack.tf/profiles/76561198148149691#!/compare/1531440000/1531612800

https://backpack.tf/profiles/76561197993931314#!/compare/1531353600/1531440000

Mini for the Toy Tailor:

Sold with ~1 key in items for a Electric Hat Protector Phononaut (16.5 keys) = 16 keys

https://backpack.tf/profiles/76561198148149691#!/compare/1531353600/1531440000

https://backpack.tf/profiles/76561198354072840#!/compare/1531353600/1531440000

Buyer quickly traded the Phononaut for a Kill-a-Watt Toy Soldier, mentioned in the recent suggestion of the Phononaut.

Mini for the Honcho:

Sold for 30 keys

https://backpack.tf/profiles/76561198316071886#!/compare/1531180800/1531267200

https://backpack.tf/profiles/76561197993931314#!/compare/1530748800/1531267200

Sale 5

Sold with 5 keys for a Max's Head (18.6 keys) + ~2 keys in items = 16 keys

https://backpack.tf/profiles/76561197993931314#!/compare/1531612800/1531785600

https://backpack.tf/profiles/76561198104872710#!/compare/1531612800/1531699200

Sale 6

Sold with ~14 keys in items and 5 pure for a Sunbeams Blast Defense, better usable over there

https://backpack.tf/profiles/76561198104872710#!/compare/1531699200/1531785600

https://backpack.tf/profiles/76561198033370726#!/compare/1531699200/1531785600

Sale 7

Sold for 20 keys

https://backpack.tf/profiles/76561198033370726#!/compare/1532563200/1532649600

Buyer side had only 2 recorded dates of their inventory

Sales I missed (thanks K1ng for finding them):

Quicksold for keys

https://backpack.tf/profiles/76561198351940193#!/compare/1532736000/1532822400

https://backpack.tf/profiles/76561198143069094#!/compare/1532649600/1532822400

No match

https://backpack.tf/profiles/76561198351940193#!/compare/1532822400/1533254400

https://backpack.tf/profiles/76561198082872208#!/compare/1532736000/1532908800

No match

https://backpack.tf/profiles/76561198149175706#!/compare/1532822400/1532908800

https://backpack.tf/profiles/76561198082872208#!/compare/1532736000/1532908800

Bulk

https://backpack.tf/profiles/76561198255903931#!/compare/1533772800/1533859200

https://backpack.tf/profiles/76561198149175706#!/compare/1533772800/1533859200

18 keys

https://backpack.tf/profiles/76561198192185050#!/compare/1534118400/1534204800

https://backpack.tf/profiles/76561198255903931#!/compare/1534032000/1534204800

18 keys + 1 ref

https://backpack.tf/profiles/76561198192185050#!/compare/1534204800/1534291200

https://backpack.tf/profiles/76561198096237015#!/compare/1534204800/1534291200

19 keys

https://backpack.tf/profiles/76561198096237015#!/compare/1534550400/1534809600

https://backpack.tf/profiles/76561198269047549#!/compare/1534636800/1534723200

No match

https://backpack.tf/profiles/76561198096237015#!/compare/1534550400/1534809600

https://backpack.tf/profiles/76561198269047549#!/compare/1535155200/1535241600

Sold for keys I assume

https://backpack.tf/profiles/76561198026042002#!/compare/1535241600/1535414400

https://backpack.tf/profiles/76561198074144580#!/compare/1533686400/1535414400

Sales: 16 / 18 / 18 / 19 / 19 / 20 / 20 / 22 / 26

16 countered by buyers, 26 an obvious outlier.

Sellers at 24 (fresh) and 25 (2 weeks old) which supports a drop.

Going with 18-22 keys here.