Yes, the 150th Anniversary of Piaget was last year 2024 but it seems like they put for sure not less efforts in their 100th Anniversary 50y ago, in 1974: Shown is an Asprey-DoubleSigned (on caseback) Altiplano ref12311 with the Sunburst Parallax-Dial -- Andrew Warhols choice for his Beta22 in 1973, too -- made for the Centenaire-Celebration by the important London-based jeweler.

The ref12311 was made in just 37 examples in total and just a fraction in this configuration.

Thanks to Piaget-Archive and -Heritage Dept for their help.