Gold Bangle marks?

I have this gold (?) bangle and I'm wondering what these marks mean. Any help would be appreciated.

 

I, too, see 375. I also see the crown (UK gold standard mark) before the 375, and the sideways anchor (denoting Birmingham) after the 375. Unfortunately, the photos aren't clear enough for my old eyes to make out the last mark, which would be the date letter.

EDIT: Forgot to mention the PJ, which would be the maker's mark, who may be the one below and is apparently unidentified.
Per silvermakersmarks.co.uk:

 

Small point, sponsor mark, as I always say, rather than maker. It’s whoever had it assayed.

 

The website calls them makers' marks, so I did.

 

I know, hon, I’m a pedant!

 

It looks like a Z. It could be the serif Z for 1974, or the 'wavy' Z for 1999:





I think it is the 1974 Z. I also remember these cuffs being very popular in the 70s.

 

Thank you for your help. A good response!