How can I determine which date mark for sure when several look similar?

by Louise
(Ireland)

What is the item?
A wedding band

Can you please provide all background information?
It was my grandmother's and may have been hers or passed down to her.

What are the markings?
F.F & ?(Unclear) , 9, .375, anchor on it's side, y






Where are the markings?
Inside the band