Andrew Nethercott Antiques has dated this piece to the 1880s.
CALCULIGRAPHE
Probably made in Paris France by Henri or brother Fred Chatelain,
Calculating Circle after Bucher’s system, circa 1878
Front scales L, Cube Root (3 turns)

Back scales S, C, Square Root (2 turns)
Good nickel plated brass case with little wear.

The dial screws with some rust but all still good and sound.
Original convex bevelled glasses with very small scratches to the centre of one and small edge chips to the other.
Case 52.5mm diameter x 20mm, weight 115 grams.
Andrew Nethercott Antiques has dated this piece to the 1880s.
Works of art, collectables, scientific and decorative antiques from the 17th - 20th century
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