Puckerings has dated this piece to the 1920s.
The back of the handle is where the hallmark can be found for Birmingham 1926, together with the makers mark for the silversmith, Horton & Allday.

The glass itself is new (by Hilkinson), making it a perfectly usable desk accessory with a clear unblemished lens & a good magnification. Excellent condition, measuring 4 1/2" in length with the glass having a diameter measuring 1 1/2".
Item ID: 33457
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Puckerings has dated this piece to the 1920s.
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