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Heuer Sidney? JRGK Movement

Heuer Sidney? New to me?

https://www.ebay.co.uk/itm/VINTAGE-SIDNEY-HEUER-AUTOMATIC-CHRONOGRAPH-CAL-11-STAINLESS-STEEL-43mm/233317430459?hash=item3652cd74bb:g:hPUAAOSwUfBdWw6G

This thread seems to indicate that JRGK made cal 12 movements too? Which company is that?

https://omegaforums.net/threads/sourcing-a-chronomatic-movement.54228/

However, most likely this is a watch produced by the family of companies connected to the development of the Cal 11 but not directly manufactured by Heuer?

Just trying to learn something on a Friday :)

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