A very rare Rear Sight ORIGINAL Winchester No 26A California Buckhorn. Height is 0.371 inches with no sliding elevator and buckhorn sides reach almost to the top. This sight was special order on a number of Winchester rifle models including the 1866, 1873, 1876, 1886, 90, 92, 94, 95 and 1903, 04, 05, 07 and 1910.