The ETA 1240 is a compact manual-wind pin lever (Roskopf-type) movement designed for ladies’ watches, prized by collectors for its simplicity and reliability in vintage timepieces. Produced by ETA SA, it exemplifies early 20th-century Swiss engineering with a focus on affordability and precision.
Key Specifications
Size: 7 x 8”’ lignes, ideal for slim cases.
Jewels: Typically 15, reducing friction in critical pivots.
Escapement: Pin lever mechanism for cost-effective timekeeping.
Functions: Hours, minutes; manual winding via rocking bar setter.
Design Highlights
The ETA 1240 employs a two-story construction in some variants, driving center seconds directly for visual appeal and smooth operation. [jewels] Its nickel screw balance often features Monorex shock protection, enhancing durability despite its vintage origins. [jewels] Parts like the barrel arbor (Ref. 195/153) and mainspring (1.60 x 0.095 x 240 x 7.5 mm) remain available for restoration.
Historical Context
Introduced in the mid-20th century, the ETA 1240 powered affordable Swiss ladies’ watches during ETA’s expansion under ASUAG. Similar to A. Schild’s AS 1240 (17 jewels, 18,000 vph, 36-42 hour power reserve), it shares a 52° lift angle for reliable amplitude. Today, enthusiasts source spares from suppliers like EmmyWatch for reviving classics.
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Watch Parts Enquiry
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Stem, Crown, Hands & Spares might be available for this movement.
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