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It seems you are referring to a pistol called **”Dúo Automat Pistole Duo Cal 6.35″**, which likely refers to a **dual-caliber, 6.35mm (.25 ACP)** handgun. The pistol you’re mentioning is most likely the **Dúo** automatic pistol, a firearm produced by **Czech** arms manufacturer **Czech Small Arms** (CSA) or an early version from **Czech** manufacturers in the early 20th century.

### Key Features of the **Dúo Automat Pistole**:

1. **Manufacturer**: The **Dúo Automat Pistole** was produced by **Česká zbrojovka** (CZ), or **Czech Small Arms**, and it gained popularity in Europe for personal defense.

2. **Caliber**: This pistol was chambered in **6.35mm (.25 ACP)**, which is a small caliber typically used for **concealed carry** and personal defense.

3. **Dual-Caliber**: The “Duo” name likely refers to the fact that this pistol was available in both **6.35mm (.25 ACP)** and sometimes **7.65mm (.32 ACP)**, allowing it to be called a **dual-caliber** pistol. This feature enabled the user to select between two types of ammunition, though **dual-caliber** guns of this period were rare.

4. **Design**: The Dúo was a **blowback-operated**, **semi-automatic** pistol, compact in design, suitable for **pocket carry** and close-quarters defense.

5. **Magazine Capacity**: Typically, the **Dúo** had a **6-round** magazine capacity, which is standard for **.25 ACP** pistols of that era.

6. **Historical Context**: The **Dúo Automat** was produced during the interwar period, with popularity rising during the 1920s and 1930s when many European countries were producing small, easily concealable pistols for personal defense.

### Importance of the Dúo Pistol:
The **Dúo Automat** is often seen as one of the earlier **pocket pistols** designed for self-defense. It falls in line with other **6.35mm** pocket pistols like the **Browning Baby** or **Beretta 1910**, which were also intended for civilians needing a small, discreet firearm.

### Conclusion:
The **Dúo Automat Pistole Duo Cal 6.35** was a **dual-caliber** pistol, most commonly found in **6.35mm (.25 ACP)** but possibly available in **7.65mm (.32 ACP)** in certain variants. It was one of the compact self-defense pistols produced by **Czech manufacturers** during the early 20th century. These pistols were popular for personal protection due to their size and ease of concealment.

(1) 6 Rnd Mag .25 Metal Colt Mag
No original box nor papers

Item may show minimal wear such as hairline scratches, dings, dents, all cosmetic none which would affect the function.see pics for more details.