Measurements: TOTAL LENGTH: 25" - EXTENSION LENGTH ONLY: 8 1/2" - SLIDE: 5/8" x 3/8" x 1/4" - TOTAL WEIGHT: 23 grams
This type of long chain had many uses for the Victorian woman. Using a watch pin, the chain could be used to hold a lapel watch. At its full length (with or without the extender), the chain could be used to hold a lady's lorgnette or, less commonly, to hold a hand warmer or muff during the cold weather.
The entire chain is Victorian. I have no idea when the extension was added. However, one could remove the extension for a shorter watch chain and then a watch pin would not be necessary. The use of a watch pin on a longer chain was to protect the watch from damage. The chain would be draped across the bodice and then hooked to the watch pin where the watch would be out of harm's way.
The slid is gold filled; decorated with red enamel. The central stone is a faceted, oval garnet.