Postby spobby » Thu Nov 21, 2013 6:28 pm
The Anchor would be the town mark for Birmingham. It's very possible that the '2' is a 'Z', Which, with the RPH mark, would be the date letter for 1974/5. RPH being the makers marks for RPH Jewellery Company Ltd.
But as Dognose stated, images would confirm it, or not.
Just a thought.
Regards
John