Platinum Hallmarks ....

[Circe]

Perusing another thread, I found whatmeworry''s link to a fantastic site on silver hallmarks (http://www.925-1000.com/index.html): would any of you happen to know if there''s a similar site for platinum? My e-ring is hallmarked with an H in a circle, and I''m rather curious as to whether or not I can track the maker down ....