Here is the catalog of Shimano in 1976.
Shimano which announced Dura-ace in 1973 had already built up the lineup from the conception of group-set.
Shimano introduced new group-set 600 in this catalog as a inferior model of Dura-ace.
600 series was a former model of Ultegra. The hub of 600 series became the bestseller in the market for touring bicycle in those days.
The catalog also introduced Dura-ace 10 as the exclusive group-set for track-racing bicycle.
Shimano tried to lighten the group-set by shortening the chain pitch from 12.7 mm to 10.0 mm.
Though there was a rumor that road model would be announced, it ended up as a track model.
Shimano had begun to sponsor European professional team Shimano Flandria as soon as they announced Dura-ace in 1973.
Dura-ace had been improved by knowhow which came from professional road racing.
Shimano had released the new model Dura-ace EX in 1978, and introduced new technology such as cassette free, Uniglide, and double-cut.
This catalog was a handy size, was provided at a specialty shop for free.
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