Grün / Assmann Age determination of watches by movement number and caliber

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Grün watches movement numbers/year of manufacture (original source: gruenwristwatches.com)

Some Grün Chronographs with a year of manufacture for age determination "not older than ...":

1894 First Grün watch worldwide, signed no. 32,000, "D. Gruen & Son Glashütte i. Sa."

from 1895 construction of the "RR-Precision Railroad" railway pocket watch

1908 first wristwatches for the military and ladies

1915 Development of the Swiss 'DIETRICH GRUEN' "extra quality" precision watches

1920 - Precision watches "extra", with up-down/chronograph/repetition

1924 pocket watch limited to 600 pieces

1924 GRUEN “50th.-Anniversary-Watch”- anniversary watch with pure gold movement

1928 GRUEN - “Techni-Quadron” duo-dial “Doctors Watch” precision wristwatch

1929 “GRUEN-ALPINA-TECNO” “Doctors Watch” from the GRUEN-ALPINA-GILDE SA.

1930 GRUEN “Techni-Quadron” – “Doctors-Watch” with jumping hour display

1935 GRUEN-CURVEX wristwatch, wrist fit/domed Curvex movement

1937 GRUEN-DRIVER “Ristside” and “Curvex-Ristside” – Driver’s Wristwatches

1943 “PAN AMERICAN” pilot and military wristwatch series with 24 hour dial.

1950 Chronograph "Chrono Timer, Cal. 450, 17 jewels, stainless steel

1950 GRUEN - Precision “Chrono-Timer”, “Doctors” chronograph, Gruen 450/850

1955 GRUEN - “Airflight” - pilot's watch with jumping dial from 12 to 24 hours

1960 GRUEN - "OCEAN CHIEF" - diving watch, - also for professional diving purposes

1962 Chronograph Gruen Precision Venus Kal 188, hand-wound

1965 GREEN - ALARM - wristwatch with mechanical alarm function

1965 Chronograph Precision, Valjoux Cal 7733, Ref 790 R

1968 Chronograph Gruen Precision Valjoux Cal. 7734, 17 jewels, date, hand-wound

1970 GRUEN - “Worldtimer” Automatic, 24 hour dial, rotatable world time display ring

19991 GRUEN - “Georgine” unisex chronograph, WG/RG, Lemania Kal 1873

1992 GRUEN - GENEVE “Moritz” full calendar moon phases, Venus caliber, decorative engraving

1992 GRUEN - GENEVE “David” full calendar moon phase chronometer chronograph

1993 Chronograph Aquarius, Valjoux Cal 7750, 18K gold, 17 jewels

1993 GRUEN - GENEVE “Aquarius” limited edition gold diving chronometer chronograph

1994 Chronograph ETA/Valjoux Cal. 7750, stainless steel, date, automatic

Source: dietrichgruen.com, Wolfgang Salm "Wristwatches", WatchWiki, gruenwristwatches.com

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