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Notes may be considered to be admissible as follows [1]:

1. Reduced-size reproductions whose lengths do not exceed 66% of the original banknote.
2. Enlarged reproductions whose lengths are at least 150% that of the original banknote.
3. Partial reproductions of any size provided less than 40 percent of one side of the original banknote is reproduced.
4. Reproductions on a material which can unambiguously and easily be distinguished from paper (reproductions on foodstuffs and hard products such as metal, glass, stone, wood, etc.).
5. Reproductions of a colour which is readily distinguishable from that of any banknotes currently in use as legal tender.
   

It is believed that Swiss notes can be displayed on Wikipedia if they meet criteria 1 and are overprinted with "specimen" or something similar.

Swiss currency is not protected by copyright:

Banknotes are not protected by the Swiss Federal Copyright Statute. However, individual works reproduced on banknotes are subject to copyright protection provided they have not been reproduced recognisably as a part of the banknote. The works protected under copyright law may only be reproduced and adapted with the permission of the copyright holder.