M4[Parmigiani Moderator]
10415
PF used this gong design at least once before, in 2014, with the Toric Resonance 3.


Photos from Monochrome. The following is excerpted from the 2014 Monochrome article.
"A normal minute repeater gong covers up to 1,5 times the perimeter of the movement. When the gong exceeds that and goes around the movement more than 1,5 times, it is called a cathedral gong. Cathedral gongs have a louder and richer sound, and are thus more desirable. The cathedral gong of the Toric Résonance 3 goes around the movement 2 times and Parmigiani shaped the gong snake-like. Because of this rather unusual shape, the total length of the gong is even longer, and the sound even richer and louder."
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M4