A bigger case ( 40 mm ) with fatter and flatter lugs we can see on some vintage Heuer and the JLC Shark Chronograph!
This second generation was produced from 1971 to 1986, in a quantity of 770 pieces.

I don't know who to credit for it, but I will happily do so on request.
This one comes with its more common insert, but there was also a Tachymeter one and a World Time one, exactly the same we find on the JLC Shark!
Best,
Nicolas