The factory version of the mighty Yamaha TZ750 were first called Yamaha TZ750R and later Yamaha YZR750.
As a first shot I will edit these black and white pictures, colour pictures will be added later.
Here is Giacomo Agostini's machine for 1975, the Yamaha YZR750/0W29.
Immediately hereafter we have the "officially" first Yamaha YZR750 from late 1975.
I finally found a few colourshots. This is from the famous Yamaha YZR750D/0W31 1977 machine.
And a black/white "naked" of the Yamaha YZR750/0W31 1977.
One of the last factory machines is this YZR750/0W31 from 1978