I'm not going to post links or mention manufacturer names, but if you use google, you will find that there is a substantial industry of replica/cloned parts for various high-end watches, especially Rolex/Tudor. And this includes older no crown-guard cases. People use these parts to build custom replica watches.
There is a least one very active forum where people discuss these topics, and the forum has sub-forums for Rolex/Tudor, a vintage sub-forum. etc.
Click to expand...