Enno Koopmann Watches Age Determination Chronometer Kriegsmarine
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Enno Koopmann was a master watchmaker and jeweler who was probably active in northern Germany, possibly in Hamburg or Bremen.
Typical products:
Pocket watches
Wristwatches
Chronometers and precise timepieces for the high-end market and the German Navy in the German Empire
| Type of work | Typical time period |
|---|---|
| A. Schild (AS) | ca. 1920–1960 |
| Felsa | ca. 1920–1960 |
| Unitas | from about 1950 |
| PUW | ca. 1940–1970 |
| ETA (early models) | from about 1950 |
A. Schild (AS) and Felsa: These works are very typical for the period 1920–1960 and were used in state-of-the-art pocket watches.
Unitas: From the 1950s onwards, Unitas (now part of ETA) began manufacturing popular watch movements, which are often found in wristwatches by Enno Koopmann.
ETA movements (from about the 1950s): These movement marks are further evidence for the late 1950s to 1960s.
Design and dial
The dial plays a major role in determining the age.
Earlier dials (approx. 1910–1940):
Decorations and embossed numbers.
Often featuring romantic or classic fonts.
The name "Enno Koopmann" often appears in fine engraving or classic script. Pocket watches of this period are often made of silver or gold-plated.
Watch dials from the 1940s–1960s:
Simpler and more functional.
Applied indices and Arabic numerals.
Simplified in design, but still elegant.
Logo often as printed or engraved lettering without much decoration.
Housing material and shape
The case material is another strong indicator of its age.
Silver: Very common in pocket watches from the 1920s to the 1940s.
Gilded brass: Also typical of the early to mid-20th century.
Stainless steel: Became increasingly important from the 1950s onwards, especially for wristwatches.
Gold (585 / 14K or 750 / 18K): For the high-quality models, especially up to about 1950.
Luminescent material
The luminous material on the numerals and hands helps to further narrow down the age of the watch.
Radium (yellowish, brownish): Common in watches made before 1955.
Tritium: Introduced from around 1955, therefore a clear indication of watches made after World War II.
Dial style and shape
Pocket watches: These were still frequently produced until the 1930s.
Wristwatches: Became particularly popular from the 1930s onwards, but only really widespread from the 1950s onwards.
Flat case designs: Tendentially found in the 1950s and 1960s.
Typical production periods for "Enno Koopmann" watches
Most “Enno Koopmann” watches date from the following periods:
1920–1960
920–1940:
Pocket watches dominate the market.
Watches with high-quality silver and gold cases and classic hand-wound movements (A. Schild, Felsa).
1940–1960:
Wristwatches are gaining in popularity.
Stainless steel housings are becoming more common.
Manually wound movements (Unitas, PUW, ETA) are more commonly used.
Simpler, but functional dials
German watchmaker
Enno Julius Koopmann was born on May 13, 1880, in Brake. From 1904 to 1905 , he completed an apprenticeship at the German Watchmaking School in Glashütte . On July 7 , 1905 , he received his master craftsman's certificate. He was recognized as a chronometer maker and began conducting chronometer tests in 1908. He resided at Hafenstraße 148/150 in Bremen from 1905 until mid-August 1944.
His son Hans Koopmann continued the business of his father Enno Koopmann.
Koopmann was a member of Saxonia
Source: Watchwiki, AI
