This wider view shows the complete clasp assembly, confirming the style as a classic box chain (also sometimes called a Venetian chain) attached to the spring ring closure.

Putting all of your images together, you have a complete overview of the markings on your jewelry piece:

• The Base Metal: The "925" stamp on the spring ring clasp identifies the structural base metal as sterling silver.

The value of a vintage "KA 1772" Italy 925 gold vermeil box chain generally ranges between $25 and $45, depending on its weight, length, and physical condition