this deck is of the swiss-french ( or french swiss) pattern .it is essentially a swiss version of the playing cards used in paris. The cards are used in the french-speaking parts of the country.
The name "piquet"is very curious. The game of Piquet as we know it today is played with 32 cards, but this deck has 36 cards. the only explaiation for this is that the swiss were refering to a very ancient version of the game, played with 36 cards.
compare this deck with a parisian deck :