Montana Vintage Arms has been making extremely high quality reproduction scopes for decades. They are pretty much all you will see being used in the scope class at NRA Black Powder Cartridge Rifle matches.
I've been using their Soule long range rear sights, Hadley eye cups (with adjustable apertures), and spirit level front sights on my match rifles since the mid 1990's. The very best of their kind available.
Windage adjustment is a micrometer barrel. Each graduation on the knob is 1/2 minute of angle, one full turn is 2 1/2 MOA, and each graduation on the flat rearward facing scale represents one turn of the barrel, or 2 1/2 MOA:
Elevation adjustment features a vernier scale. With my sight radius, .010" is just about one minute of angle. Loosening the eyecup allows for elevation adjustment via the knob on top of the long screw. Tightening the eyecup locks it. 200 yard setting:
1,000 yard setting:
Front sight with spirit level and interchangeable apertures. The spirit level becomes very important as the eyecup gets adjusted further up the elevation scale:
