Helvetia - Libertas
There are two different types of Swiss 20 franc coins. The first type with a laureate head of Liberty, wearing a coronet bearing the word "LIBERTAS", with the inscription "CONFEDERATIO HELVETICA". The reverse shows a 5 pointed star above the red cross of Switzerland on a simple shield within a wreath. The inscription at either side of the shield 20 FR, with the date below. The letter B, the mintmark for Bern, appears below the wreath. This type was issued form 1886 to 1896 inclusive.
 

Vreneli - (Vrenelli)
The second type known as "Vreneli" or "Vrenelli" has a female head with plaited hair, a garland of flowers (edelweiss), with mountains behind, And the inscription HELVETIA above. The reverse has a swiss cross on a more ornate shield superimposed on an oak branch with ribbons. The value 20 FR appears at the sides of the shield, and the date below. This type was issued from 1897 to 1935, then again in 1947 and 1949. The model for the portrait was Francoise Engli.