he Eterna Calibre 1436 is a robust, mid‑20th century automatic movement that occasionally turns up in vintage Eterna watches from the 1960s–70s, prized by collectors and tinkerers for its sturdy construction and classic rotor design.
Why Enthusiasts Like It
It’s a classic Swiss “workhorse” automatic, typical of the era when Eterna was still producing many of its own calibres in-house.
The movement layout is clean and straightforward, with well finished plates and a good level of perlage and straight brushing, making it a pleasure to service and display in an open‑back case.
Its rotor is mounted in a robust, low‑friction system, often with a ball‑bearing or low‑friction pivot, which gives it a smooth, reliable winding action without excessive noise.
As a vintage automatic, it’s a good candidate for restoration: parts like the balance, mainspring, and winding wheels are sometimes still available from specialist suppliers or can be adapted from similar ETA/AS calibres.
For Hobbyist Watchmakers
Dismantling is reasonably straightforward; the movement follows a typical automatic layout, with the bidirectional winding reverser on the back and a central rotor.
The balance is usually a screw‑balance type with a flat hairspring, which is familiar to anyone who has worked on 1960s–70s Swiss calibres.
When servicing, pay attention to the click and reverser wheels, as wear there can cause slipping or inefficient winding; a good lubrication and pivot check usually restores smooth operation.
It’s a good movement to practice timing: it runs at a standard frequency, so it can be adjusted with a standard watch timer to ±10–20 sec/day in normal conditions.
Technical Specifications (Typical)
Type: Automatic, bidirectional winding
Diameter: ~13 lignes (approx. 29.5 mm)
Height: ~4.5–5.0 mm (depending on variant)
Frequency: 18,000 vph (2.5 Hz)
Jewels: Typically 17–21 jewels
Power reserve: Around 38–40 hours
Features: Central seconds, day/date or date only, depending on the complete movement variant
Shock protection: Eterna’s proprietary shock system (similar to Incabloc/Anchormatic style).
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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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