The Vintage Wrist Watch Company has dated this piece to the 1920s.
There are hallmarks on the T-bar and the two clasps for Birmingham 1908 and 1909. Each of the links has the lion passant silver mark.

The chain also comes with a small silver penknife, 4.5cm long when closed. The penknife is later than the chain with hallmarks for Birmingham 1968.
The total weight of the chain and penknife is 63.9g.
PRICE INCLUDES WORLDWIDE POSTAGE
The Vintage Wrist Watch Company has dated this piece to the 1920s.
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