Mystery Mark Inside Ring - Have You Any Idea?

[kenscott]

Inside a non-magnetic, heavy ring, I have found a symbol I have tried to recreate here via Photoshop. Do you know what it means?

 

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[Frankn]

There is a book at the library in Baltimore that lists all hallmarks that have been registered all over the world. There might possibly be the same on the internet some where. Frank...-

 

[TheRingFinder]

If you find out - let me know what a "D" with an arrow going through it means.