First of all, a quick hello, I'm new to this forum... basically found it while coming up with dead ends after searching for a mark on a ring. This ring was in my late mother's jewellery collection and I've been having trouble working out the date and maker's mark. I think there's a mark from chester import assay or something, and not sure which B in the date lists this one is... but more than, I'm stumped with the A K maker mark in diamond shapes... I can find various AK makers, but not with this shape. Please could someone identify this, and if possible, the date?
Thanks in advance for any help!