Julie Cartwright Antiques has dated this piece to the Victorian era.

Suspension loop.
All sprung mechanisms in good order.
Hallmarks:
S.Mf or Sampson Mordan.
London Assay mark.
Lion Passant.
Date letter "K" for 1885.
Dimensions:
Diameter: 3cm / 1.2 inches.
Height: 1.5cm / 0.6 inches

Weight: 27 g .
Condition:
Good.
Sprung mechanisms in very good order.
Push button in very good order.
Snaps shut nicely.
Strong hinge.
Maker's marks very clear.
Font roundel with minor crease.
Postage:
PLEASE DO NOT FORGET TO ADD POSTAGE AT CHECKOUT.

Postage UK: £8 Special Delivery Next day.
Postage overseas: £17 International Signed For.
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Julie Cartwright Antiques has dated this piece to the Victorian era.
You can view the stock and full dealer information on the Julie Cartwright Antiques Profile Page