Here is the catalog of Shimano Dura-ace in 1973. Dura-ace was produced as a first group-set in Japan.
Back in those days, Crane was already released as the highest grade rear derailleur. Shimano produced front derailleur, sifter, hub, chain wheel, freewheel, brakes, head parts newly, and announced them in the November 1972.
Prior to the development, Shimano established an independent section in the company to change their previous conception (how they can mass-produce and supply good parts cheaply).
In the following year, Shimano began to sponsor Frandria which was professional road racing team in Belgium. Dura-ace was used in the hard professional road racing in Europe right after the announcement, defeated, and trained in the real competition. Mr. Hiroshi Nakano who is a director of the Bicycle museum in Sakai city (the hometown of Shimano) now was a person who was sent at there as a mechanic, and reported about the performance of Dura-ace. He had posted several articles (The race in Europe which I attended) to New cycling magazine (from May 1974 to February 1975). I used to read them earnestly in those days.
Perhaps we can say that the challenge to the professional road racing in Europe in this time was the greatest factor that Shimano had become "Shimano of the world".
By the way, people pronouncing as "Jura-ace" carelessly even now must be my generation.

This catalog was A4 size, 8 pages. It was issued in February 1974 for bicycle shop.

Here is the front cover. The character style is more angular than present one.

A brief introduction to shops is on the following page.

Several photographs of Europe and USA are introduced in this page.

Each part was introduced from here.
The four packages were introduced first. One package of derailleur set, and three packages of single product (sifter, bar-end controller, rear derailleur) were on the page.

The derailleur set (front derailleur, rear derailleur, and sifter) was called "10-speed set". It was composed of spring cable (outer, inner), 6 mm hex wrench, cable guide which fix on the down tube, outer receiver which fix on the chain stay and bracket which fix on the press end. Those were prepared for a bicycle which didn't have the direct attachments of small parts.

The front derailleur, chain wheel set, 5/ 6 speeds freewheel were on the page.

There were six kinds of sprocket combination.
1. 13-15-17-19-21T
2. 14-16-18-20-22T
3. 15-17-19-21-24T
4. 14-17-21-24-28T
5. 13-14-15-16-17-18T
6. 13-15-17-19-21-23T

Looking from the present viewpoint that the freewheel has 10 sprockets, the combination of sprockets of those days was so rough.

The protector was attached to the chain wheel. Of course the set without protector was also prepared.

Here was brake set, hub set and head set.
The brake arch was the large size. It was the regular size of those days. The bracket of brake lever was bigger than Campagnolo of those days. Therefore some of Campagnolo fans thought it was ugly. I myself liked this bracket because my palm was big. However, next model became small.

Two kinds of hub such as small flange and large flange were prepared. 5-speed model (120 mm) and 6-speed model (126 mm) were prepared for each flange. Head parts were so-called "Campa type".

Spare parts were packed like photos above.
Five BB cups were packed in one package. It was prepared for shops.

The details of each package are on the back cover. Please compare them with above photos.

Even now, the rear derailleur Crane is popular on the internet auction or free market. I used to use derailleur set, chain-wheel, and brake-set for Katakura Silk and Pegasus road-racer. Since Campagnolo was too expensive for me in those days. Though the inner sprocket of Sugino Mighty-compe was 42T, Dura-ace was equipped with 39T as standard. It was useful for tourists. Nowadays it became the world standard. Times have changed.