early 80s Koga-Miyata FullPro shell:
The ProLuxe and FullPro-L models had a sharper looking shell with 2 larger M's, rotated 180 degrees. Like shown overhere >>
1978 Jp catalog
early 80s Koga-Miyata ProRacer shell:
This variation with 6 holes came on more Koga-Miyata models.