What are these marks?

I’ve got this necklace and I’ve been searching but I can’t find what these marks mean, I was hoping someone could help?

It’s a London hallmark with the date letter H for 1982. The marks are:

  • Maker’s mark (PRR?), not known to me
  • lion passant mark for sterling (.925) silver
  • uncrowned leopard’s head mark of the London Assay Office
  • date letter


Thanks I really appreciate it, it’s so interesting to know.