In the related links box below, I posted the information.
The value of an Estul Twist-2 pocket derringer can vary based on its condition, age, and market demand, typically ranging from a few hundred to over a thousand dollars. Factors such as rarity, historical significance, and any unique features can significantly influence its worth. For an accurate appraisal, it's recommended to consult a firearms expert or appraiser familiar with antique or collectible firearms.
No published history
5-75 USD or so