Are all of these examples the same serial number? i went recently and it was difficult to see, but it looked like the same serial numbers?

Brazilian Empire adopted the Winchester '66 in 1872, to replace the Spencer M1860 carbines then issued to the Cavalry troops. Brazilian Army was keen to lever actions and even put a final order in 1891, when the '66 was at the end of its production run. Great video, keep on the great work. Best wishes from the State of São Paulo Military Police Museum (Brazil).