AN UNUSUAL 7IN. RADIUS SEXTANT POSSIBLY BY C.J. KETTLEWELL, CIRCA 1860
the three-circle oxidised brass frame with polished arc signed as per title and inset with black composition, itself inset with a contrasting white scale divided to 150º and stamped 'PATENT COMPOSITE ARC', braced index arm with vernier and magnifier, seven shades, two mirrors, pin feet and wooden handle, contained in possibly associated lined box with three sighting tubes, drop handle and securing hooks and trade label for 'Frederick Smith, Southampton' -- 11in. (28cm.) wide

Apparently an unrecorded maker, it's not certain whether C.J. Kettlewell was the maker or an owner - no location or address has been provided as is usual for a maker and this form of arc is possibly unique at the time of writing. It seems to be an attempt at a time of transition from wooden instruments with their easier to read scales to all metal ones with silver scales which in time can be polished away.

Condition Report
Appears to be in good overall condition.

We are pleased to provide you with a general report of the condition of this property. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Charles Miller Ltd is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue. NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD “AS IS” IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE.