Omega

DeGeus
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DDR version

The finest of the series, grade D, with 16 or 17 jewels was available as chronomètre from size 13''' up to 20''' with a 'bulletin' issued by the Bureau / Observatory in Bienne, Neuchatel or Genève - adjusted to variations of less than a minute per month, in 5 positions and under extreme temperatures.

Consequently, evolving took place into:

grade DD - very fine finished, for the bigger sizes 18, 19 and 20'''.

grade DR - with extra-fine finish, for 19 and 20''' with 19 jewels, balance screws in gold.

grade DDR - this appeared in 1905, intended for official chronometers and observatories, made in silvered nickel, equipped with 23 jewels (incl. 2 diamonds), all parts polished and/ or gold-finished, in short: non plus ultra!

Of the 19'''DDR 900 pieces were made in 1906/ 07 and in 1911.

396 pieces of size 20'''DDR were crafted in 1905 and 1908.

?

The 19'''DDR version was replaced in july 1922 by cal. 43.15 which was named: "Verybest".  Also equipped with 23 jewels, 600 pieces of this Verybest were made.

This info comes from the former museum-curator Marco Richon, hope this satisfies your enquiry Achim.

best, Ben.