A World War II Aircraft bubble sextant, circa 1940, the mark IX Air Ministry sextant made for determining the altitude of the sun, with photocopied instruction booklet by Henry Hughes & Son Ltd. Length 8.27 in.
- Circa - A Latin term meaning 'about', often used in the antique trade to give an approximate date for the piece, usually considered to be five years on either side of the circa year. Thus, circa 1900 means the piece was made about 1900, probably between 1895 and 1905. The expression is sometimes abbreviated to c.1900.
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