BA111OD Chptr_Δ.6

~$3,208 · 1 CHF = 1.234 USD (2026-07-22)

Year

2024

Category

Challenge

Reference

CHPTR_Δ.6

Case

ø 40 mm · Acier

Material

Steel

Dial

Skeleton/Openworked

Movement

Mécanique à remontage automatique Réserve de marche: 42 h, 28800 alt/h

Water resistance

50 m

Price tier

$2K–$5K

Country

🇫🇷 France

CHPTR_Δ is BA111OD's first watchmaking complication, a timepiece where a satellite hour wheel "rolls" around a fixed central wheel, with the tip of the hour hand describing a triangle.

More photos and full details on the official GPHG page.