People often wonder just how good their watches are. A quality seal can help provide an answer: it shows that the watch has passed a test for its timekeeping ability and, in some instances, the quality of its finishing. COSC and the Geneva Seal are by far the best-known issuers of quality certificates, but there are many others. Some, like these two, test watches from multiple brands; others, such as the Patek Philippe Seal. Here’s a look at 11 quality-testing systems.