CH was Switzerland -- it stands for Confoederatio Helvetica
which is interesting (and slightly puzzling) because the modern official Swiss names don't use that form. The official names are: Schweizerische Eidgenossenschaft (German), Confederation Suisse (French), Confederazione Svizzera (Italian).
There is a very interesting museum of all the original documents forming the confederation (1291) and subsequent ones as the various cantons joined. Can't remember the name of the village at the moment (ICLIU). We were at the family chalet for the 700 year celebrations, a tremendous event.

Rod