Render unto Caesar . . . and looking back there is no doubt that Nikon was Rome even before the Nikon F was released. The obvious casualty of it's release was the very short lived Canonflex. However, prior to that Nikon and Canon were strictly rangefinder makers. No the proper "Grand Daddy" title would have to be given to the original Asahi Pentax. You only have to look at the features it incorporated at the time of it's release in 1957 to see that all SLR's thereafter was fashioned after it starting with the most important SLR feature - no black out instant return mirror. This singular feature had to be overcome in order for SLR's to take full advantage of through the lens accuracy as opposed to the rangefinder way.
BTW, great pics!