Mondaine Electronic Date 'Lic. Swiss Made ATO'
Dress/Tool Hybrid, Electronic/Pre-Quartz · Mondaine Watch Ltd., an independent Swiss brand famous for the SBB Swiss Railway clock design.
Period: Transition / Early 1970s. The UFO-style case and 'Electronic' movement markers are hallmarks of this era.
Type
Dress/Tool Hybrid, Electronic/Pre-Quartz
Brand
Mondaine Watch Ltd., an independent Swiss brand famous for the SBB Swiss Railway clock design.
Movement
Electronic/Electromechanical (ESA Dynotron series), Lic. ATO. Likely 18,000 vph, battery-powered balance wheel.
Dimensions
38mm-40mm diameter, 12mm thickness, 20mm lug width. Large 'UFO' presence for its time.
Description
A striking example of early 1970s Swiss 'space age' design, this Mondaine features a 'UFO' case and an electronic movement that bridges the gap between traditional balance wheels and modern quartz.
Key Features
Transitional 'Electronic' text with the diode symbol (||), circular brushed case finishing, and the Hatot/ATO license marking.
Dial Description
Champagne sunburst dial with applied thick black/gold baton indices and matching baton hands. Date window at 3 o'clock.
Case Material
Gold-plated (likely 20 microns) base metal with a circularly brushed (sunburst) top finish.
Crystal Type
Acrylic/Plexiglass, domed profile, typical for the early 1970s period.
Bezel Details
Fixed, integrated into the 'UFO' case design with heavy circular brushing/graining.
Crown & Pushers
Small, recessed push-pull crown at 3 o'clock, gold-toned to match the case.
Bracelet or Strap
Brown leather strap with contrast stitching; appears to be a modern replacement rather than the original band.
Caseback Details
Likely solid stainless steel screw-down or snap-on back with battery hatch typical for early electronic watches.
Movement Type
Electronic/Electromechanical (ESA Dynotron series), Lic. ATO. Likely 18,000 vph, battery-powered balance wheel.
Water Resistance
Vintage non-water resistant; strictly splash-proof only. Not suitable for swimming or moisture exposure.
Origin & Provenance
Swiss Made; movement manufactured under license from Leon Hatot (ATO).
Age Estimate
Circa 1970-1974. This represents the brief period between mechanical dominance and the Quartz Crisis.
Cultural Significance
Represents the 'Lost Era' of watchmaking where companies frantically innovated with battery-powered balance wheels to compete with early quartz electronics.
Condition Notes
Very Good. The sunburst brushing on the case is well-preserved; the dial is clean with minimal spotting; hands show minor oxidation.
Value Estimate
$250 - $450 USD depending on the functionality of the electronic circuit and case plating integrity.
Care & Maintenance
Requires specialized 1.55V silver oxide batteries; service every 5-7 years by a vintage electronic specialist as parts are becoming rare.
Similar Watches
Hamilton Electronic, Bulova Accutron (Tuning Fork), and early Seiko EL-370 series.
Interesting Facts
The 'ATO' license refers to Leon Hatot, a pioneer in horological electronics whose patents were used by many Swiss brands in the 60s/70s.