Julie Cartwright Antiques has dated this piece to the 1930s.
The magnifying glass mounted with a 4cm diameter steel mount inset with magnifying glass. The letter opener with a 12cm stainless steel blade.

Hallmarks:
H&H Ltd for Hasset & Harper Ltd
Birmingham Assay Mark.
Lion Passant.
Date letter "L" for 1934 for the magnifying glass.
Date letter "G" for 1931 for the letter opener.
Condition:
Very good.
Handle in excellent condition on magnifying glass.

Glass with no surface scratching.
No loss to the enamel.
Minute pin prick loss on one side of the handle on letter opener, as can be seen on images.
Dimensions:
Magnifying glass: Length 10cm / 3.6 inches.

Glass diameter: 4 cm / 2inches.
Letter opener: Length 21cm /8.2 inches.
Postage UK: £8 Special Delivery Next day.
Postage overseas: £10 International Signed For.
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Julie Cartwright Antiques has dated this piece to the 1930s.
You can view the stock and full dealer information on the Julie Cartwright Antiques Profile Page