Beautiful vintage condition - with the typical patina (see images)  

This type of swiss leather ammo pouch was used with the Schmidt Rubin rifles and carbines, and later with the K31.   

With markings dates.  

Marks:

• Swiss cross + J
  
• J. Gauch Sattler Wunnewil 50 (1950)
  

Pouch has the following measures: 20x10x5cm