Cercle hydrographique, known as "de Borda", in partially blackened brass and silver-plated graduated ribbon, with turned wooden handle.
Signed and numbered 1.
Diameter: 26.5 cm.
Wear, scratches, a few stains and oxidation.
In a walnut case, with brass side handle, with accessories and brass plate on front, engraved "Service hydrographique, Cercle Hydrographique n° 503, Édouard BOUTY n° 503" (wear, numerous scratches and dents, and a few cracks and chips; some accessories missing).
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