I have been able to come up with more of Rado's preoccupation with alpine geography. I just love those specially designed mountain like watches! But many of them were also in the Diastar range like the Rado Eiger.

* means photo included..

Alpineum* - is a museum with a diorama of the Alpes in Luzern, Switzerland
Arosa* - is a city in Switzerland.
Berg - is the name of several cities in Switzerland, Austria, Germany and also German for mountain.
Bernina - is a mountain(Piz Bernina), a mountain pass and a district in the Swiss eastern Alpes
Breithorn - ("broad horn") is a mountain near Zermatt in Switzerland
Brienzer - is an inhabitant of the Swiss city of Brienz - in the near the Brienzer Rothorn
Brig - is a city and a district in the Kanton Wallis in Switzerland
Durance - The Durance is a river in the French Alps.
Ebnat - is a city in Switzerland 
Eiger* - is a mountain near Zermatt in Switzerland
Esel - is a mountain in Switzerland - and German for donkey
Freiger - or Wilder Freiger is a mountain in Tirol at the Austrian-Italian border
Furka - is a mountain pass connecting the Swiss federal states Uri and Wallis
Gorner - is a glacier near Zermatt in Switzerland
Jorasses - or Grandes Jorasses is a mountain near the Montblanc in France
Kapell - is a skiing and hiking area in Austria
Kriens - is a city near Luzern in Switzerland
Lauberhorn - is a mountain and a famous ski race located near Wengen in Switzerland
Limmat - is a river in Switzerland
Lumino* - is a municipality in the district of Bellinzona in the canton of Ticino in Switzerland.
Matterhorn - is one of the most famous mountains of the Alpes near Zermatt, Switzerland
Meilen - is a city at the Lake Zürich in Switzerland
Monte Rosa - is the 2nd highest mountain of the Alpes in Switzerland
Murten - is a city in Switzerland
Randegg - is a city in Austria
Rothorn - ("red horn") or Brienzer Rothorn is the name of a mountain near Brienz in Switzerland, a lot of other mountains in the Alpes wear this name
Scheidegg - is a mountain pass in Switzerland(Große/Large and Kleine/Small Scheidegg)
Schilthorn* - is a mountain near Mürren in Switzerland
Schreckhorn - is a mountain in Switzerland
Simplon - is a mountain pass in Switzerland
Ticino - is both a river and a Kanton(federal state) in Switzerland (see also Lumino above)

Now for some photos!

Alpineum
   

Arosa
   

Eiger
   

Lumino
       

Schilthorn
   

This is the uncommon chronometer version of Rado's original Diastar design, costing a princely sum of 2300 euro or 2600 USD at the time (130000 yen, as is consistent with advertising of the period). Made in the early 1970s, it is very much like the 1962 Diastar which also featured a segmented, applied hour chapter, date window at 3:00, and the 'original' oval Diastar scratchproof case. The 21600, 6bps ETA 2783 movement (rebranded Rado 2797) with incabloc, date quickset, center seconds and 46h power reserve, has a Triovis micrometer-regulation and the COSC-registration number engraved. It also has had a necessary superior refinishing to achieve chronometer status.
The COSC was founded 1971 as a non-profit-organisation to standardise the Chronometer norms of the Swiss observatories, so this DS 1E is made around 1972 - 1975. It is very rarely seen as every single movement was certified with a test log, making it so very expensive.

Photos below are not mine, but I suppose this is what the insides look like. I will have to check!

       

The COSC was founded 1971 as a non-profit-organisation to standardise the Chronometer norms of the Swiss observatories, so this DS 1E is made around 1972 - 1975. It is very rarely seen as every single movement was certified with a test log, making it so very expensive.

           

This larger model however, measuring 35x45x13mm, has a facetted sapphire crystal, very uncommon at the time and therefore of course advertised as such. Check the add below with Google Translate..

   

The case front shows no wear, as it is Tungsten Carbide (therefore it sold originally with an unconditional warranty of three years). The condition is 'Very Good' to 'Excellent' and the ETA 2783 movement is keeping accurate time; service history is unknown, but the movement is clean; date functions properly at midnight.
The original NSA bracelet with signed Rado clasp is present on this watch. Original inner and outer boxes are present as well.

   

A lot of Rados in the late 1960s, 1970s came on NSA bracelets with Rado-signed clasps. The Novavit SA (NSA) was sited in Carouge, Kanton/federal state Genf/Geneve, Switzerland and was liquidated in 1999.
It had been founded in 1947, the business was to produce bracelets for the watch industry with almost blanked parts and also blanked parts for the whole fine mechanic. It seems to have been the family enterprise of a family called Nobs. The company logo is a triangle inner a circle.NSA became world famous for their very comfortable high quality watch bracelets, especially for the so called 7-row. This was applied for patent in 1966 and patented in 1967. Probably they also had a patent for their clasps - both, the short and the long (folded) type have a spring mechanic which makes it automatically a bit longer if there´s enough pressure, e.g. in the summerheat, when the wrist swells a bit.
I´ve seen 7-rows and 3-rows with signed clasps of a lot of watch companies in Switzerland as Tag Heuer, Jaeger LeCoultre, Rado, Felca/Titoni, Zodiac, Technos, Roamer, Louis Rossel, ... .
They also had been available in the aftermarket with NSA-signed clasps.
7-rows had been also produced in USA (Kreisler, under license) and Italy (I don´t know if licensed or for NSA).
You can find NSAs in a lot of variations in material (SS, GP, titanium, "bicolour", synthetic material, PVD-coated) and surface design. The company still registered a few patents in the 1980s but finished work in 1995 (finally liquidated 1999).

I knew about the ratcheting clasp and the dive clasp extension, but there are other types to be found. Behold the glide lock which can be found on the Rolex bracelets or the Parnis. Now I am on the quest to find a cheap one! Anyone?

   

This is fun, I found some adverts of Rado - enjoy.

                   

The Rado Diastar was quite the watch in the days... Watch this advert.





Th good news, they can still be found as vintage watches, of course, they are scratch proof so they have kept their looks mostly.

I stumbled upon Rado recently... Much to my delight I found a nice vintage sixties Schilthorn. I will post more about it, but here are some photos for now. They are not up to par, but hey, they are the seller's...

               

Damn, as a collector it is difficult to decide which watch to wear on a trip. You have choices, right? So I decided to trim it down to just two - one for the day and one for the night...

Criteria are:

Day watch

Takes everything my wrist can
Easily adjustable or flexible steel bracelet

Night watch

Tritium!
Leather band

And the verdict is... Seiko Turtle on Angus Jubilee with Taikonaut ratcheting buckle for daytime and Ball Engineer Master GMT