Lancastrian Jewellers has dated this piece to the 1960s.
There are a full set of hallmarks on the back of the head indicating it was imported and assayed in London in 1963.

We also have the matching necklace for sale, please send us a message if you are interested in the set.
Matching Necklace - https://www.etsy.com/uk/listing/1560258058/vintage-snake-serpent-marcasite-sterling?ref=listings_manager_grid

METAL
Sterling Silver
STONES
Marcasite and Paste eyes
WEIGHT
19.27 grams
MEASUREMENTS
Bracelet approx 7" Length
Chain measures 5mm across
Snake head measures 9mm wide
Widest part of Tail 5mm
HALLMARKS
Fastener 925

ELD (E Ltd), Import mark, 925, Date letter h (1963)
SILVER
CONDITION
This wonderful snake bracelet is in excellent Vintage condition. The marcasites all remain secure and the fastener firmly shuts with an added safety catch for peace of mind. The links are in good condition with no damage or marks to note of. The snake bracelet boasts a crisp set of hallmarks to the back of the head. This would be a lovely gift or a unique addition to anyones collection.
Lancastrian Jewellers has dated this piece to the 1960s.
We are a third generation jewellers in the north of england, UK. Specialising in quality antique, vintage and fine jewellery
You can view the stock and full dealer information on the Lancastrian Jewellers Profile Page