It’s an in house Gerard Perregaux movement developed away from the other Swiss Manufacturers who had banded together to make a new battery powered quartz movment. Gerard Perregaux went their own way though and got their watch out first, and that’s why these watches are known as “1st Quartz”.
It's a really great watch. Indestructible seemingly. The ceramic bezel protects everything from knocks. Be aware that the 37 is 100m non screw down unlike the bigger one. But the 42 just seems huge.
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