The Vintage Japanese SIMEX Mariner's Sextant, Model MK-1, is a rare and collectible maritime navigational instrument made of brass and steel in Japan. This antique original sextant by SIMEX includes a mahogany case and comes with a certificate from September 12, 1977. This piece of history embodies the craftsmanship and precision of vintage navigational tools from the late 20th century, making it a valuable addition to any maritime enthusiast's collection.