★ Butterfly Knife | Doppler | Phase 2

It is one phase of the Butterfly Knife Doppler finish, released on March 15, 2017. It drops from the Spectrum Case as a rare special item. The Butterfly Knife Doppler (Phase 2) runs from 0.00 to 0.08 in float, so it comes only in Factory New and Minimal Wear, and it has a StatTrak version.

Factory New peaked at $13,339 on May 4, 2025 and trades 72% below that peak. It is down 25% over the past year and down 14% over 90 days. Over the past year it traded between $3,450 and $7,236. Its all-time low was $2,724, on October 24, 2025. The CS2 price history API carries the full Butterfly Knife | Doppler (Phase 2) (Factory New) price history.

Minimal Wear costs 1.2 times as much as Factory New, the cheapest wear.

C5Game asks the most at $3,873, 3.9% above the cheapest Factory New listing on CSFloat.

Doppler comes in four phases, Phase 1 to Phase 4, plus three rarer gem patterns: Ruby, Sapphire and Black Pearl. The pattern seed fixes the phase, and each phase trades as its own item with its own price. Black Pearl is the most expensive phase at $10,544, and Phase 3 the cheapest at $1,819.

18 Factory New copies sold in a recent 7-day window. Factory New is liquid and usually sells within hours.

The Doppler (Phase 2) finish also comes on the Bayonet, the Bowie Knife, the Falchion Knife, the Flip Knife and 13 other weapons. It counts toward the The Spectrum 2 Collection Knives index.