Vivid Plasma Katyusha

New price: 15 keys

[proof below]

SALE #1 = 18 keys

https://marketplace.tf/items/30094;5;u16

Sold for $35 ( / $1,97 ) = ~18 keys.

SALE #2 = 15 keys

https://backpack.tf/profiles/76561198125791160#!/compare/1531699200/1531785600

https://backpack.tf/profiles/76561198127045035#!/compare/1529971200/1531785600

Sold for 15 keys. Sold the Memory Leak Katyusha to scrap and some of the keys in the 15 key group come from scrap.tf, meaning it high likely sold for 15 keys but the backpack of the buyer wasn’t updated during the time he obtained the keys.

SUMMARY

Sales: 15 / 18 keys

Sellers: -

https://backpack.tf/suggestion/5b4f4183cf6c755e7c58cfeb

Excluding marketplace sale. Going with 15 keys.