There are 1 Six Shooters trading cards tracked on HobbyCardIndex, spanning Boxing. The most valuable is the Six Shooters #197 at $1.99 raw.

Source: HobbyCardIndex · Updated daily · https://hobbycardindex.com/players/six-shooters

Six Shooters Cards

Name: Six Shooters Card Price Index — Historical Data
Creator: HobbyCardIndex
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1 cards · Boxing

All Six Shooters Cards