I believe the image on this beautiful intaglio to be Poseidon "God Of The Seas because of the trident below his image which he used to churn the oceans to form storms. He is credited for creating all sea life and when mocked for his creations he responded with creating a horse.
This locket has been jeweler tested to be at least 10K gold with embellishments of silver. It's front an back covers are set with natural stones. One of which is an intaglio and the reverse initials. It could simply be an L.
It is a gorgeous spinner fob adorned with a lovers knot at the top. This estate keepsake opens and closes just as it should and has one picture frame inside. It did come with 2 photos which I will include with purchase. It is in lovely condition and measures 7/8'' x 1-3/8'' with the bail.