Eta Caliber C07 621

ETA Caliber C07.621

Eta Caliber C07 621

The ETA caliber C07.621 is a Swiss made automatic watch movement with a day-date function. It has 25 jewels and a beat rate of 21,600 vph, 3Hz. This caliber is essentially an evolution of the ETA 2836-2 and as a Powermatic 80 movement, it offers a more modern 80 hours power reserve. The C07.621 is available as a COSC chronometer certified movement. Despite some incorrect information online, this caliber is not equipped with a silicon hairspring or synthetic escapement.

This caliber is only available for use in Swatch Group brand watches such as Mido (cal. 80), Certina, and Hamilton (cal. H-30).

Note: This caliber listing is still being updated, but feel free to start discussions on it in the comments below…

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Sam
Sam
6 months ago

Hi i have this movement on my hamilton pan europe but its co7621+ what the plus means! I think its updated to silicon hairspring because i noticed the 2 star on the hairspring same as the murph 38mm new release

Mark
Mark
5 months ago
Reply to  Sam

Correct – the C07.621+ has a Nivachron / silicon balance spring – this must be a recent update in the year 2023 across all ETA brands. I‘m curious if it keeps time like the COSC models …

Sam
Sam
5 months ago
Reply to  Mark

Thanks for reply and yes its very accurate in +3 seconds! Constantly every 24 hour i notice that to keep good time must be fully wounds

Mark
Mark
5 months ago
Reply to  Sam

Update: I found on the ETA database that Nivachron is NOT silicon based: The Nivachron balance spring is produced in the traditional way using a non-magnetic titanium-based compensating alloy. Four patents have been filed by Nivarox-FAR since 2017 on this new alloy. The name Nivachron is an internationally-registered trademark by Nivarox-FAR. Advantages of the Nivachron™ balance spring Greatly reduces the influence of magnetic fields and residual effects on the watch’s operation. Resistant to temperature variations in normal wearing conditions. Resistant to shocks in normal wearing conditions. And I measured the accuracy of my Mido with my timegrapher amd it is between +1… Read more »

David
David
6 days ago
Reply to  Mark

I think the quote that Nivachron “Greatly reduces the influence of magnetic fields” is more accurate than saying it’s “non-magnetic”.

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