This photo is the front cover of the April 1957 issue of Cycle magazine which is oldest magazine I have and advertisement of Sunstar.
Cycle magazine was a former magazine of present New cycling magazine.
Mr. Imai who was a chief editor of New cycling magazine had been working at there.
980M on the ad was a model which was introduced at the end of the catalog as "special maniac type".
It was composed of Unno D2*D2 (called D by D) Cr-Mo tube (lug-less frame) and exterior 3-speed derailleur, and the weight was 12.4 kg.
It was the highest grade model in those days.
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