Andrew Nethercott Antiques has dated this piece to the 1890s.
Strong trombone link chain, matching makers and 18 crown gold hallmarks throughout.
Hallmarked Birmingham 1893, makers mark J.G.&S for John Grinsell & Sons

Two spring dog clips, “T” bar and central bolt ring with shaped profile.
Total working length of chain 18,1/2" or 47cm, weight 75 grams
Andrew Nethercott Antiques has dated this piece to the 1890s.
Works of art, collectables, scientific and decorative antiques from the 17th - 20th century
You can view the stock and full dealer information on the Andrew Nethercott Antiques Profile Page