William Lyman invented these sights, and founded the Lyman Gunsight Company in 1878. These are wonderfully precise replicas. The Lyman No. 2 sight for Winchester 1886 lever action rifle, fits the original Winchester (without tang safety), and Browning replicas with 2.190" hole spacing.
Sights include longer tang screws; one modified 12-28, one 6-.5mm, one 10-36 forward mounting screw, detailed instructions for vertical alignment, and a fitted hard storage case.