Andrew Nethercott Antiques has dated this piece to the Victorian era.
Singers Patent design floating mother of pearl dial marked for
NEGRETTI & ZAMBRA LONDON

Polished brass hunter watch type case with push button spring release.
Paper instruction label inside the lid, “To render this compass luminous…..
Brass outer case, nickel plated brass gimbal housing, oxidized brass gimbal ring and compass bowl.

All in excellent condition and lively working order.
The dial shows insignificant losses of the black, apparent marks on the dial are the steel needle showing through the translucent material.
Outer case diameter 1,3/4? or 46mm
weight 102 grams.
Andrew Nethercott Antiques has dated this piece to the Victorian era.
Works of art, collectables, scientific and decorative antiques from the 17th - 20th century
You can view the stock and full dealer information on the Andrew Nethercott Antiques Profile Page