★ Butterfly Knife | Rust Coat
Obtainable from the Spectrum Case and the Spectrum 2 Case, the Butterfly Knife | Rust Coat is a Covert balisong distinguished by its freely pivoting blade, which enables quick deployment or concealment. Described as a memento from Siege, the finish remains fully functional despite its weathered appearance. The float range begins at 0.40, meaning this knife will always display visible wear. StatTrak versions are available for tracking eliminations.
Cheapest wear we have on this page. Pattern / float overpay is extra.
Spectrum Case: (case+key) ÷ drop chance. Average, not a promise.
Covert / missing collection peers: no contract estimate.
Price History & Performance
Price by Wear
★ Butterfly Knife | Rust Coat cannot roll Factory New, Minimal Wear, Field-Tested because its float cap is 0.4–1. Wear ranges.
Cases & Drop Odds for ★ Butterfly Knife | Rust Coat
Probability of unboxing this skin per single case open, expected number of opens until you get one, and the case's expected return based on the current market value of every skin inside.
| Case | Drop Chance | Expected Opens | Open Cost | Market EV | EV vs Cost |
|---|---|---|---|---|---|
 Spectrum Case | — | — | $8.51 | $0.65 | -92.4% |
 Spectrum 2 Case | — | — | $7.24 | $0.65 | -91.0% |
Drop chance = official rarity odds ÷ size of that rarity pool inside the case. Market EV is the probability-weighted average of every skin's lowest current listing. "EV vs Cost" compares that EV against the case + key price — negative means opening loses money on average.
Where to Buy ★ Butterfly Knife | Rust Coat
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