Super antique silver Albert chain, with lovely links, they remind me of those on an antique dog collar.
All the links are hallmarked. You can see from the photos that I have moved the bit of loose chain at the front and put it at the back to create more length.
 
weighs - 45.7g
measures - 16.5" long
links - 14.3mm x 7.3mm, ring at back 10.4mm diameter
T- Bar 38mm long
makers mark HB & S
Good antique condition