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The ETA C07.661 brought traveller-GMT functionality to a comparatively accessible range of Swatch Group watches. Ricardo Sime’s 2021 account identifies its first use in the 2018 Certina DS Action GMT and describes its relationship to the ETA 2824.2 and Powermatic 80 family. The available account documents the movement’s reported specifications and watch examples, but not the engineering team’s development process.
What makes a traveller GMT different?
A traveller GMT is designed for people who change time zones. Its local hour hand can be moved in one-hour steps without disturbing the minute hand or GMT hand, making it easier to set local time after a flight while keeping a second time zone displayed.
An office GMT generally works the other way around: its GMT hand can be adjusted independently in hour increments, which is useful for tracking another time zone while staying in one place. The distinction is about which hand can be adjusted separately, not whether a watch has a GMT hand.
What the 2021 account says about the ETA C07.661
Ricardo Sime’s 2021 Time+Tide Watches article identifies the ETA C07.661 as a traveller-GMT movement first released in 2018 in the Certina DS Action GMT. It describes the calibre as based on ETA 2824.2 and as part of the Powermatic 80 family. In Sime’s framing, that combination brought traveller-GMT functionality to a comparatively accessible Swatch Group watch range.
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Sime calls it “A movement Swatch quietly developed and released years ago that could completely change the landscape of GMT watch offerings.” That is the article author’s assessment, not a quoted statement from a Swatch Group spokesperson. The account does not identify the engineers or explain design trade-offs, manufacturing methods, or testing.
Specifications reported for the movement
The following figures are those reported in Sime’s 2021 article, rather than newly verified manufacturer data:
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| Specification | Reported detail |
|---|---|
| Jewels | 25, according to Ricardo Sime’s 2021 article. |
| Beat rate | 21,600 beats per hour, according to Ricardo Sime’s 2021 article. |
| Power reserve | 80 hours, according to Ricardo Sime’s 2021 article. |
| Date | Linked to movement of the hour hand, according to Ricardo Sime’s 2021 article. |
These specifications should be tied to the C07.661 as discussed in that article. The Powermatic 80 family name alone does not establish that a watch has traveller-GMT functionality; the exact movement and model matter.
Which watches did the article identify?
| Watch | Relevance in the 2021 article |
|---|---|
| Certina DS Action GMT | Identified as the first model released with ETA C07.661, in 2018. |
| Mido Ocean Star GMT | Named as a recent example at the time of publication; Sime reports a 44 mm case. |
| Tissot Chemin des Tourelles Powermatic 80 GMT | Named as the lower-priced example in Sime’s historical 2021 range. |
| Rado Centrix GMT | Named as the higher-priced example in Sime’s historical 2021 range. |
For the Tissot and Rado examples, the article gives historical prices of US$875 and US$2,000 respectively. Those are 2021 examples, not current price guidance. The cited account does not provide a current comparison of price, availability, case size, or model-specific specifications across all four watches.
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What “affordable” means in this account
The significance is functional: the C07.661 put a traveller-style local-hour adjustment into watches across several Swatch Group brands, rather than limiting the examples to office-GMT operation. “Affordable” is relative to the range of watches discussed in Sime’s 2021 article; its historic prices cannot establish what the models cost now.
The article supports a concise account of the calibre’s reported lineage, launch context, specifications, and named uses. It does not provide a detailed history of how Swatch Group developed it, so claims about internal strategy, engineering decisions, or the development team would go beyond what that account establishes. Read Ricardo Sime’s 2021 Time+Tide Watches article.
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