Julie Cartwright Antiques has dated this piece to the 1870s.

Niello is a black mixture of copper, silver and lead sulphides, used as an inlay on engraved or etched metal, usually silver.
Hallmarks:
Small French guarantee mark on the back of the hinge.
Dimensions:
Height: 6cm / 2.3 inches.

Diameter: 1.7cm / 0.5 inches.
Condition:
Very good
Niello decorations in very good condition, minor loss to the front.
Strong hinge.
Postage:
PLEASE DO NOT FORGET TO ADD POSTAGE AT CHECKOUT.
Postage UK: £8 Special Delivery Next day.

Postage overseas: £18 International Signed For.
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Julie Cartwright Antiques has dated this piece to the 1870s.
You can view the stock and full dealer information on the Julie Cartwright Antiques Profile Page