How to tell if a watch has radium?

How can one determine if a watch contains radium? Is there a specific test or indicator that can be used? Given the potential health risks associated with radium, it's important to be able to accurately identify its presence in older watches or timepieces. Does the type of watch, such as a mechanical or quartz movement, have any bearing on the likelihood of containing radium? Are there any common symptoms or signs that could indicate the presence of radium, such as discoloration or unusual wear? Understanding how to properly identify and handle watches with potential radium content is crucial for both collectors and the general public.