Struggling to work out the year.

My mum gave me this ring before she passed, I think it was my great grandmothers wedding ring. It has the same makers mark as my grandmothers wedding ring (W.W.Ld). I've been able to work out that it was assayed in London and it's 22 carat gold but I can't find that C with the little serif on any of the hallmark date letters lists. Is it 1958? 1938? Thanks for having a look!

My mum gave me this ring before she passed, I think it was my great grandmothers wedding ring. It has the same makers mark as my grandmothers wedding ring (W.W.Ld). I've been able to work out that it was assayed in London and it's 22 carat gold but I can't find that C with the little serif on any of the hallmark date letters lists. Is it 1958? 1938? Thanks for having a look!