It was listed by Puckerings. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Puckerings has dated this piece to the 1910s.
The eyepiece is made from Mother of Pearl and signed " J. Duvelleroy London ", I believe their shop was in New Bond Street, London's smartest shopping street.
The lens to the end is convex, so this one wasn't made to stand up straight but to be laid down on it's side.

All good optically, a little dust inside and the guilloche enamel is without damage. Quite superb, measuring 1 3/4" extending to 2 1/4".
Item ID: 34225
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Puckerings has dated this piece to the 1910s.
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