Of the three possible choices of mark suggested; "Manufactured in Switzerland", "Swiss Made" or simply "Swiss", the first would meet the requirements but was too long to fit comfortably on a watch dial or movement, and simply "Swiss" was probably considered insufficiently definite to meet the British requirements. This makes it clear that the Swiss thought that sterling was actually The Swiss Federal Cross is often seen in cases and on movements. All four of these marks must be present in a valid and legal British hallmark. These dates were during the great depression and it is evident that the watch hallmarked and then kept in stock in London for several years before it was sent to Dublin and hallmarked for a second time. It means that the item has been assayed and stamped hallmarked by someone independent of the manufacturer. If you click on the image a larger version will pop up.
These assay agents and many others registered their sponsor's marks so that they could organise the hallmarking of imported watches.
ChineseArgent: All Silver: Art, Antiques, Hallmark & Articles
I have provided a lot of examples of genuine British hallmarks on the page at British hallmark examples. It is clear from the minutes of the meeting that the Swiss authorities thought that sterling silver was actually 0. World Silversmiths Directory. The watch that the case back is from has an anonymous Swiss movement. However, after a request from the the archivist of the Incorporation of Goldsmiths, who looks after the historical records of the Edinburgh and Glasgow Assay Offices, the editor of the NAWCC Bulletin has allowed the article to be made publicly available and it can now be downloaded by clicking on this this link: