Antique Victorian Gold-Filled Book Chain Locket Pendant Necklace ETC8788

This is an antique gold filled book chain necklace with a rectangle photo locket pendant. The locket will hold 2 photos inside. There is some bright green verdigris on the bottom of the locket. That same spot is on the inside, too. The locket measures 1" long x 13/16" wide. The chain measures 5mm wide x 18.5" long.
This is a previously owned, antique necklace. Therefore, light wear can be expected.