Vintage 60's Engraved Gold Oval Locket

1960's Vintage Engraved oval gold Locket. This locket is hand-engraved with what I think is a handwritten capital F, but could well be a capital J. 😆 I just cannot tell for sure. It has no tarnishing, and is made of an unhallmarked higher-quality gold-tinted metal, but I am not sure what kind of metal this is for sure. Maybe it is gold-plated, but cannot tell for sure. 3.5 × 1.75 cm In excellent vintage condition!