A RARE Rear Tang Vernier Sight for Stevens rifles. This ORIGINAL Stevens sight was called "The #102 Graduated peep sight" and is rarely found today in this type of EXCELLENT condition. The elevation changes on this sight are accomplished by loosening the eyepiece, adjusting up or down, then tightening the eye piece. There are windage adjustments on the back, and the side is marked in 5-unit graduated intervals. The folding sight is held upright with a leaf spring in the base.