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

Both lid finial and tray with a distinctive ovolo border. The lid with a slot for the spoon. The solid silver spoon , dated Sheffield 1920.
Hallmarks on both lid and tray:
JD&S for James Dixon & Sons
Sheffield Assay Mark.

Lion Passant.
Date letter "o" for 1906.
Spoon:
CB & S for Cooper Brothers & Sons Ltd.
Sheffield Assay Mark.
Lion Passant.
Date letter "c" for 1920.
Dimensions jar:
Height: 8cm / 3 inches
Diameter: 10cm / 4 inches.

Dimensions Tray:
Length: 16cm / 6.2 inches.
Width: 11 cm / 4.2 inches
Condition:
Excellent.
Glass in perfect condition.
Silver lid and spoon in perfect condition.
Postage UK: £8 Special Delivery Next day.
Postage overseas: £15 International Signed For.

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Julie Cartwright Antiques has dated this piece to the Edwardian era.
You can view the stock and full dealer information on the Julie Cartwright Antiques Profile Page