Vintage B.S.A. Short Stem No 8 Aperture Peep Sight

This is a vintage used B.S.A. Short Stem No 8 Aperture Peep Sight in good to very good condition with signs of use and wear, most of the original finish. It is marked 0-80 for elevation, 0-0 for windage and booth work, 1/4 on the left side near the base. It features a 6-position rotating disc. It’s in nice condition, showing a patina, light surface oxidation and typical surface wear and no significant damage. The rotating adjustment mechanism functions well and produces an audible click when operated. Please see photo's for fine details.