The Nivada Flica 3660 is a classic wristwatch that reflects the mid-20th-century design and craftsmanship of Swiss watchmaking. Here are some key details about this model:

1. **Brand**: Nivada is a Swiss watch brand with a rich history, known for producing reliable and stylish timepieces. The Flica line is one of their notable collections, often characterized by its elegant and minimalist design.

2. **Model**: The Flica 3660 is a specific model within the Flica series. It features a clean and timeless design, typical of dress watches from the 1950s and 1960s.

3. **Case Material**: The watch has a stainless steel case ("fond acier inoxydable"), which ensures durability and resistance to corrosion. Stainless steel is a common material for watch cases due to its strength and aesthetic appeal.

4. **Swiss Made**: The "Swiss Made" label indicates that the watch was manufactured in Switzerland, adhering to strict quality standards. Swiss watches are renowned for their precision and craftsmanship.

5. **Movement**: The reference number 6325 020 likely corresponds to the specific movement used in the watch. Nivada often used reliable manual or automatic movements from reputable Swiss manufacturers.

6. **Design**: The Flica 3660 typically features a simple, elegant dial with minimalistic hour markers and hands. It is designed to be a versatile dress watch suitable for both formal and casual occasions.

7. **Historical Context**: Nivada watches, including the Flica series, were popular during the mid-20th century. They are now considered vintage timepieces and are appreciated by collectors for their historical significance and classic design.