The Vintage Wrist Watch Company has dated this piece to the 1900s.
The date letter is a little marked on the clasp, probably 1901.

Each of the links on the chain has the silver lion mark together with one which has the date letter for Chester 1901.
The chain has a shorter chain attached, upon which hangs a later GWR enamel and sil-ver fob, hallmarked for 1937, and awarded for a swimming competition in 1937.
Total weight 43.5g
The Vintage Wrist Watch Company has dated this piece to the 1900s.
Specialists in antique and vintage wrist watches and pocket watches
You can view the stock and full dealer information on the The Vintage Wrist Watch Company Profile Page