A PAIR OF SEXTANTS BY 'HEATH & CO. LTD. CRAYFORD LONDON S.E.', ''BELL PATTERN (No.1)

late Victorian or Edwardian, both bearing the 'Certificate of Examination' by the 'Kew Observatory, Richmond Surrey' with wooden cases bearing brass engraved plaques of owners to the top; the first, 26cm long x 14 high x 24cm deep; and the second, 26cm long x 14cm high x 24cm deep (2)