Identify gold hallmarks on earrings

[Chocolate2020]

My mother gave me some of her old jewellery and she told me these earrings were hers in the 1960s and they are gold .

I'm trying to identify the hallmark but because it's so small I can't get a great picture . Can anyone help ?

Picture didn't upload well . I could make out cmr 375

I'm not an expert, but 375 means it's 37.5 percent pure. Today it would be referred to as 9 karat gold.