Mozart's early string quartets are an important part of his compositional development. However, there seems to be a confusion in the numbering and cataloging system you referred to. The String Quartet No. 1 in G major, traditionally known as K. 80 (73f), was composed in 1770.
Here are the details:
### String Quartet No. 1 in G major, K. 80 (73f)
- **Key**: G major
- **Köchel Number**: K. 80 (73f)
- **Year of Composition**: 1770
- **Movements**:
1. Adagio
2. Allegro
3. Menuetto
This quartet was composed when Mozart was just 14 years old during a trip to Italy. It reflects his early experimentation with the string quartet form and shows the influence of Italian music on his style. Despite its early date, the quartet displays the young composer's burgeoning talent and understanding of string writing.
