Lawsuit Nippon B-45 Early 1970's made in Yamaki

EXTREMLY RARE 1970's lawsuit B-45 Nippon acoustic guitar made in the Yamaki factory in Japan. It has a beautiful sunburst finish and gorgeous inlaid herringbone binding and sounds absolutely amazing and plays great! The neck is really straight and the guitar is in good shape except for 2 repaired cracks on the top and it looks like they took off the bridge to repair it. I searched every where for a similar guitar and could not find one to compare it to the serial # is 220508 stamped on the inside at the bottom of where the neck connects to the body.