Julie Cartwright Antiques has dated this piece to the 1960s.
Both mustard and salt fitted with the original green glass liners.

Sold with a pair of condiment spoons dated London 1945.
Hallmarks:
On the condiment set:
D&F for Deakin & Francis.
Birmingham Assay Mark.
Date letter "U" for 1969.
Lion Passant.
On the spoons:
W&W for Wakely & Wheeler.

London Assay Mark.
Date letter "K" for 1945.
Lion Passant.
Condition:
Excellent.
Dimensions:
Pepper:
Height: 6cm / 2.3 inches.
Diameter of base: 2.7cm / 1 inch approx
Salt cellar and mustard:
Height: 4 cm / 1.6 inches.

Diameter: 5cm / 2 inches.
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 1960s.
You can view the stock and full dealer information on the Julie Cartwright Antiques Profile Page