Indeed!
The 38mm diameter automatic Altiplano may be difficult because modern movements may be ultra thn but need to be large diameter to achieve multiple functions in future.
Piaget R&D worked on an automatic movement of 13 ¼ lignes, meaning 29.9 mm in diameter – driving hour, minute and small seconds functions. Thus, a 40mm diameter Automatic Altiplano may still be possible.
Officially, one does not exist as they are pushing the 43mm launch version...........
Regards,
MTF