Art. 124 PILA from 2022

Art. 124 b. Form
1 As to form, contracts are valid if they meet the requirements set out in the law applicable to them or in the law of the place where they were concluded.
2 The form of a contract concluded between persons who are located in different states is valid if it meets the requirements set out in the law of one of those states.
3 The form of a contract is governed exclusively by the law applicable to the contract itself when, in order to protect a party, such law requires compliance with a specific form, unless that law allows the application of another law.
Es besteht kein Anspruch auf Aktualität und Vollständigkeit/Richtigkeit.