BA111OD turns the hour into a triangle with the CHPTR_Δ 40mm

The CHPTR_Δ [MdP] 40mm approaches time as geometry. While the minute hand behaves conventionally, a bright yellow hour marker follows a softly triangular hypocycloidal path, tracing the inside of a sculptural three-sided dial structure. This smaller blue version builds on BA111OD’s earlier 44mm execution, preserving the technical drama in a more wearable case.

Developed with watchmaker Olivier Mory, its distinctive display is driven by BA111OD’s manufacture module 09310 over a Soprod M100 automatic base. The stainless-steel case measures 40 mm across and 12.9 mm thick, with 50-metre water resistance and a 42-hour reserve. It is a one-time run of thirty pieces, priced CHF 2,800, with availability planned for late October 2026.