Back in 1977 would that have been the old original Bronica with the Nikkor optics. The 50mm Nikkor for the Bronica was a much better lens that the 50mm Distagon of the era. I worked with a 'Blad shooter at the time who kept a Bronica and 50mm just for his wide-angle shots. I would watch from the sidelines with my Rollei SL66 and chuckle.
The Nikkor glass was decent ... I don't know ~~ the Rollei SL was the camera I went to after the Bronica > still my favorite ~!