Victorian-era gold-filled mesh pocket watch fob ribbon

Manufacturer IdentificationThe Hallmark:
The stamp on the swiveling dog clip reads ”S.O.B. & CO.”.The Maker: This stands for the S.O. Bigney Company (founded by Sidney O. Bigney) based out of Attleboro, Massachusetts. They were a highly prominent manufacturer of gold-filled jewelry, watch chains, and fobs operating from the late 19th century through the mid-20th century

Approximate Age & ComponentsThe ”PAT'D” Stamp:
The internal spring mechanism on the vest pocket clip is stamped ”PAT'D” (Patented), which was common for Bigney’s proprietary mechanical fastener clips from the 1900s to 1915 era.Measurements: At roughly 4.5 to 5 inches long (as shown by your tape measure), this is the standard length for a formal mesh vest ribbon fob