What are the adjustments on a Redfield International match sight?

Redfield International sights are 1/8th minute compared to many target sights that are 1/4 minute. The Redfield International Match Metallic Target Sight, Item No. 712000, with 7/8" dia. aperature disk, has 1/4 minute adjustments per click and originally sold for $32.95. The International Mark 8, Item 71300, with 7/8" dia. aperature disk has 1/8 minute adjustments per click and originally sold for $39.95. The windage adjustment screw is marked "MK 8" on this model.