Vintage large opening locket pendant necklace suspended on a modern curb chain. 

Please note that vintage items will show gentle signs of wear. Any major imperfections will be clearly highlighted. This item is not applicable for an exchange or refund. No further discounts may be applied. Final Sale.

Hallmarks
These are partially rubbed away but from what remains, we would guess that they are the following:
Anchor (Birmingham, England)
Lion (925 Sterling Silver)
Letter Y (Year 1975)

Material
Pendant - Sterling Silver
Chain - Mixed Metal Alloys

Sizing
Chain -20-23" Adjustable Extender Chain
Pendant - 30mm