Vintage Antique Cameo Pendant Necklace

Vintage circa 30s-40s or earlier, cameo pendant necklace, the cameo is hand carved out of a shell with exquisite mastership and details of the lady's hair style and jewelry, set in yellow gold tone metal, unsigned, likely gold filled, some untreated age patina on the metal, such a gorgeous piece. Overall in good condition for the age, some expected wear) aging signs as seen in the close up photos, from a non-smoking environment. Measurements: the chain, non original to the pendant, measures 41 cm, pendant 4x3 cm.