Identifying Hallmark On Bracelet

Hi All,

I would like some help identifying the Hallmarks on this bracelet.
I have inherited this from my late Grandfather who passed recently. Was purchased around 40 years ago. I am trying to identify this Hallmark but unfortunately cannot find anything similar to how this looks.

I apologise for the poor photos, the Hallmarks are so small and I do not have a magnifying glass.


EDIT: This was purchased in the UK, most likely from somewhere in or around London.