Age determination of wristwatches according to the 10-point method
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Production period rounded to 5 years |
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1. Elevator. |
Manual winding |
1890 - present |
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Automatic with pendulum winding |
1935 – 1955 |
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Automatic with rotor winding |
1930 - present |
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Automatic with planetary rotor |
1955 - present |
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Automatic with ball bearing |
1950 - today |
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Automatic in women's watches |
1950 - today |
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2. Housing. |
Base with hinge |
1890 - 1940 |
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Bottom with pressure lock + adjustment pin |
1910 - 1925 |
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Bottom with pressure closure |
1920 - present |
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Bottom screwed, water-protected |
1930 - present |
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Bottom pressure closure, water-protected |
1950 - today |
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Lug with metal bracket |
1890 - 1960 |
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Lug with spring bar |
1935 - present |
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Stainless steel case |
1930 - present |
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3. Inhibition. |
Cylinder escapement |
1890 - 1945 |
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Pin lever escapement |
1925 - 1980 |
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Ruby lever escapement |
1890 - present |
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Fast oscillators (19800-21600) |
1950 - today |
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High-frequency oscillators (28800-36000) |
1965 - present |
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4. Balance wheel (in conjunction with stone anchor) |
Compensation balance (bimetal) |
1890 - 1945 |
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Monometallic balance with screws |
1900 - 1970 |
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Balance wheel without screws |
1960 - present |
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5. Spiral (in conjunction with stone anchor) |
Breguet hairspring (blue) |
1890 - 1945 |
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Breguet hairspring (white) |
1925 - 1960 |
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Flat spiral (white) |
1925 - present |
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Spiral back split |
1950 - today |
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Regulating hand missing |
1960 - present |
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6. Pointer. |
Central second, indirectly driven |
1930 - 1965 |
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Central second, directly driven |
1950 - today |
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Calendar with hands |
1920 - 1960 |
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Calendar with numbers in the window |
1930 - present |
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Bar-shaped pointer |
1960 - present |
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7. Dial. |
Enamel dial |
1890 - 1930 |
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8. Numbers |
hour marks |
1930 - present |
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1 to 6 Arabic numerals |
1930 - 1960 |
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The "12" (Arabic) in red |
1915 - 1925 |
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Running number rings, mechanical |
1925 - 1935 + 1970 - 1980 |
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9. Clock stones. |
Watch stones in screwed chatons |
1890 - 1945 |
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Balance stones without shock protection |
1890 - 1955 |
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Balance stones with shock protection |
1935 - present |
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10. Special works. |
Hand-wound chronograph, minute counter |
1915 - 1980 |
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Hand-wound chronograph, hour counter |
1945 - today |
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Chronograph without column wheel |
1945 - today |
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Chronograph with column wheel |
1915 - 1980 |
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Automatic Chronograph |
1970 - present |
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Alarm clock. |
Hand-wound alarm clock |
1950 - 1980 |
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Automatic wrist alarm clock |
1960 - present |
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Diver's watch. |
Hand-wound diver's watch |
1945 - 1980 |
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Automatic diver's watch |
1955 - present |
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Battery watches. |
Balance drive |
1955 - 1975 |
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tuning fork drive |
1960 - 1980 |
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Analog quartz watch |
1970 - present |
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LED digital quartz clock |
1970 - 1980 |
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LCD digital quartz watch |
1975 - present |
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Analog + LCD digital quartz clock |
1980 - present |
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tuning fork chronograph |
1975 - 1980 |
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Analog quartz chronograph |
1980 - present |
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Analog quartz alarm clock |
1980 - present |
Wristwatch replicas in the style of the 1920s and 1930s, which frequently appeared on the market after 1970, are easily recognizable by their shock protection. When evaluating the "10-point scale," I point out that there are exceptions to every rule.
Source: Expert group for historical clocks at Raesfeld Castle