ETA 976.001 Quartz Movement
ETA 976.001 is an ultra thin Swiss two hand quartz movement that became far more important than its own name suggests. Its architecture appears directly, or through closely related factory and service derivatives, in watches signed Omega, Longines, Tissot, Rado, Chanel and others. This reference separates a movement's original factory base from later service interchange, because those are not always the same thing.
1.55 V low drain silver oxide, approximately 6.8 mm × 1.65 mm. The 364 / SR621SW is the same approximate diameter but is thicker and should not be treated as the specified ETA 976.001 cell. ETA's current product data gives a theoretical battery life of roughly 74 months for the current movement; vintage branded executions may differ in consumption, electronics and service history.
ETA 976.001 technical specifications
| Manufacturer | ETA SA |
| Type | Analogue quartz, hours and minutes |
| Ligne size | 5½ × 6¾ lignes |
| Dimensions | 13.00 × 15.15 mm |
| Movement height | 1.95 mm |
| Approx. total height to minute pinion | 2.90 mm, common H1 configuration |
| Jewels | 6 |
| Quartz frequency | 32,768 Hz |
| Battery | 321 / SR616SW |
| Nominal voltage | 1.55 V |
| Hand fitting | Hour 1.00 mm · minute 0.55 mm |
| Common H1 hour wheel height | Approx. 0.85 mm |
| Coil resistance | 2.10–2.40 kΩ |
| Setting | Two position stem; hand setting with stop/storage breaker in setting position |
ETA 976.001 brand cross reference
This is the key distinction: confirmed base means documentation ties the branded calibre directly to 976.001; factory lineage means the maker documents an earlier calibre becoming or leading into 976.001; service interchange means parts and movement suppliers list 976.001 as the practical service family, which is not proof of identical original manufacture.
| Brand | Calibre / model | Relationship | What it actually means |
|---|---|---|---|
| Omega | 1375 | Service interchange | Omega historically records 1375 as ETA 979.002, not 976.001. Modern service references commonly place 1375 in the 976.001 interchange family. Useful replacement lineage, but do not rewrite the original calibre history. |
| Omega | 1455 | Factory lineage | Omega records 1455 as ETA 279.001, later becoming ETA 976.001. This is one of the clearest documented bridges into the 976.001 platform. |
| Omega | 1456 | Confirmed base | Omega documents 1456 as the rhodium plated, personalised version of 1455 on the ETA 976.001 base, with Omega finishing and engraving. |
| Longines | 153 | Confirmed service cross ref | Watch material references map Longines 153 directly to ETA 976.001, 6 jewels, battery 321. |
| Longines | 153.2 | Service interchange | Listed in the ETA 976.001 service family by specialist movement suppliers. Verify branded plates, hand height and dial attachment before a complete movement swap. |
| Longines | 153.6 | Service interchange | Also listed within the 976.001 service/interchange family. Treat as a service cross reference rather than proof every component is cosmetically identical. |
| Tissot | 3370 | Confirmed service cross ref | Movement correspondence tables and parts suppliers map Tissot 3370 to ETA 976.001, with the same 0.55 / 1.00 mm minute/hour hand fitting family. |
| Tissot | DV | Documented correspondence | Movement correspondence catalogues map the Tissot DV designation to ETA 976.001. Verify the exact signed execution before ordering cosmetic or case specific parts. |
| Rado | 153 | 976 family / service ref | Specialist service references list Rado 153 in the ETA 976.001 interchange family; period Rado examples also identify calibre 153 as 976.001 derived. |
| Rado | 135 | Service interchange | Listed by movement suppliers as a 976.001 service cross reference. Exact Rado execution should be checked before assuming a full movement swap. |
| Chanel | Matelassé | Model application | ETA 976.001 is documented in Matelassé examples. This is a watch model application, not a claim that every Matelassé reference uses the same movement. Check the specific case and reference. |
Cross reference does not mean automatic drop in replacement
Before replacing a branded derivative with a generic ETA 976.001, verify hand fitting and height, hour wheel and cannon pinion height, dial feet or dial attachment, stem and crown interface, movement holder or case spacer, signed bridges and plates, battery clamp geometry and the exact electronic/module revision. A movement can belong to the same service family and still require parts transfer or adaptation.
Omega 1375, 1455 and 1456: the important distinction
The Omega sequence is a perfect example of why a cross reference needs context. Omega 1375 was originally based on ETA 979.002. It is now commonly serviced within the ETA 976.001 interchange family, but calling the original 1375 simply an ETA 976.001 erases its actual factory lineage. Omega then records 1455 as ETA 279.001, later becoming ETA 976.001. The Omega 1456 is the clearest direct derivative: Omega describes it as the rhodium plated version of 1455 and its calibre specific service material identifies the personalised Omega execution of the ETA 976.001 architecture.
Longines and Tissot derivatives
Longines 153 is directly mapped in watch material references to ETA 976.001 with 6 jewels and a 321 battery. Longines 153.2 and 153.6 are also consistently grouped into the 976.001 service family. Tissot 3370 is a strong cross reference to ETA 976.001, while the Tissot DV designation is likewise mapped to 976.001 in movement correspondence material. For servicing, these mappings are highly useful; for restoration, signed plates, hand heights and case specific components should still be retained wherever possible.
The wider ETA 976 service family
Service suppliers commonly group the ETA 976.001 with earlier or closely related ETA 279.001, 979.001 and 979.002 movements, and ETA technical material shows significant shared parts across this family. The same service network also commonly cross references branded calibres including the following:
| Brand / maker | Reference | Service relationship |
|---|---|---|
| Bulova | 6130.17 | Listed in ETA 976.001 interchange family |
| Certina | 135 / 153 | Listed in ETA 976.001 interchange family |
| Movado | 25 | Listed in ETA 976.001 interchange family |
| Seiko | 2C20 | Service references note interchange potential but explicitly flag different dial feet and hands; do not treat as a simple cosmetic swap |
| ETA / ESA | 279.001 / 979.001 / 979.002 | Earlier related service family with substantial parts/interchange relationship to 976.001 |
Can a generic ETA 976.001 replace a branded version?
Sometimes, but not blindly. For a broken branded movement, a generic ETA 976.001 can be an extremely useful donor or replacement platform where the service cross reference is established. In a good restoration, the watchmaker should first compare movement height, hand stack, stem position, dial attachment and holder geometry, then transfer original signed or brand specific components where required. The fact that Omega, Longines, Tissot and Rado personalised this small ETA platform is precisely why a bare calibre number is not enough.
ETA 976.001 factory documentation
The current ETA technical communication contains the parts catalogue, exploded diagrams, assembly order, lubrication points and electrical testing data. The Omega historical calibre list is useful for distinguishing original Omega factory bases from later service interchange.
FAQ
321 / SR616SW, 1.55 V low drain silver oxide.
Not originally. Omega records calibre 1375 as ETA 979.002. ETA 976.001 is widely listed as a later service interchange/replacement family.
Yes, with nuance. Omega records 1455 as ETA 279.001 and specifically states that it became ETA 976.001.
A documented personalised, rhodium plated Omega execution in the 1455 / ETA 976.001 family. See the dedicated Omega 1456 reference.
Longines 153 is directly mapped to ETA 976.001 in watch material references; 153.2 and 153.6 are also listed in the 976.001 service family.
Tissot 3370 is a strong service cross reference, and movement correspondence material also maps Tissot DV to ETA 976.001.
Yes, ETA 976.001 is documented in Chanel Matelassé examples. The exact watch reference should still be checked because this does not establish one movement for every Matelassé variant.
Possibly, but a complete movement swap must be checked for hand height, dial attachment, stem and crown interface, movement holder and brand specific plates or modules.
Core ETA dimensions and service data are taken from ETA technical documentation. Omega lineage is separated from modern service interchange using Omega historical calibre nomenclature. Longines, Tissot, Rado and other cross references are labelled according to whether they represent direct calibre correspondence, service interchange or model application rather than being presented as universally identical movements.
Longines L153 cross-reference
The Longines L153 is documented as an ETA 976.001 family cross-reference. See the dedicated Longines L153 movement archive for the relationship, battery cautions and watch-specific applications.
Omega 1455 cross-reference
Omega calibre 1455 is the documented Omega lineage associated with ETA 279.001, later identified as ETA 976.001. See the dedicated Omega 1455 movement reference for the branded calibre relationship and service cautions.