United Kingdom - European Union Member States Hallmark by: Sean
These series of marks on your gold ring could be modern United Kingdom hallmarks. In 1973 a core group of European nations signed the Vienna Convention on the control of the fineness and the hallmarking of precious metal objects.
The United Kingdom is a contracting state member. There are certain guidelines to European Union Member States Hallmarks. The fineness of the metal is "375" which you have correctly ascertained is 9 carat gold. This mark is the "CCM" or Common Control Mark that verifies the metal's purity. The crown in a box next to the compulsory mark could be what's called the "Voluntary Mark". Hope this might help.
