This is a high quality vintage Japanese saltwater akoya cultured pearl invisible or hidden clasp bracelet. 

The pearls measure 7.50mm and are round. They have fantastic luster with bright rosy pink overtones. Medium amount of natural blemishes. 

The clap is invisible set into two pearls. You twist it to tighten. Total length is 7 inch, because of the clasp it is for a smaller wrist. From mid-century.  

All pearls are truly vintage and have only been lightly cleaned and restrung.