Switzerland, one of the signatory states of the 1998 Washington Declaration, has thus far neither established an institution for dealing with Nazi-looted art nor a legal framework for implementing the Washington Principles. Consequently, due to the absence of standardized normative guidelines, an amorphous and contourless practice of decision-making has emerged, which has not yet been the subject of in-depth research. Simultaneously, the implementation of the Washington Principles through the establishment of a commission in Switzerland is currently the subject of intense discussion. This publication provides a first systematic inventory of Switzerland's restitution practices and derives a coherent system from the findings.