Majorica Spanish pearls

Vintage. Well kept for 40+ years. These were a gift to me in the 1980’s. They are 18” ..... 6 mm pearls. There are no flaws. The chain clasp has tarnished. It has a double clasp; box clasp and spring ring. The pearls are lovely. No discoloration. All paperwork was kept in the box as you can see in the pictures.