Yes, many earlier sources of service data assumed you would be using the older type of scope that had a horizontal (time) drive that was based on the frequency of a free running oscillator. That would often quote a scope sweep of 7875 for the scope horizontal signal. I suppose for convenience they also assumed that you would want two cycles of the monitored signal on the screen.
Maybe those scope often had distortion at the start and end of a horizontal sweep. This causes confusion today with modern scopes.
Another complication you should be aware of is that the exact TV horizontal frequency standard was changed in about 1954 when the color standard came out. The color system used a color carrier reference of 3.58 some MHz. The vertical and horizontal TV frequencies were slightly changed so that they would be obtained from dividing down the color carrier frequency. So the vertical frequency became slightly less that 60Hz and the horizontal frequency became a bit lower than 15750. From that time even Black and White TV broadcasting used the newer frequencies. The only place this makes any difference is color TV AND modern sources of video. You couldn't see the difference in frequency on an (analog) oscilloscope.
I'm not sure about the 1077 (there were at least two versions) but earlier B&K model generators of this type had a vertical frequency derived from the 60Hz power.
Here is a good video introductions to oscilloscopes.
https://www.youtube.com/watch?v=KYEMPm0c9kY