Trying to find somewhere to identify jewelry markings. I know this is a cufflink but I don’t know where to look for finding out what the markings mean. When I google I just find markings for foreign countries(I’m in Massachusetts).
I'm about 99.9% sure that hallmark is for 'Swank'. They made/make costume jewelry, particularly men's cuff links, tie bars, etc. I'm not sure but they may still be in business today. As far as your original question, I don't know of any one particular web site that is a good place to research all jewelry marks. There are so many it would be a huge undertaking to try to create such a database
I have probably fifty bookmarks and several books for figuring out hallmarks and still find stuff regularly that I cannot ID Generall the sites I use are broken up by type of jewelry, native made, costume, designer gold, vintage plastic, etc.