Otsuka Lotec No. 6 - Serial #10328 (Pre-Owned) SARPANEVA Horology By The Sea is

Horology By The Sea is thrilled to present this Grönefeld One Hertz Red Gold

Complete with Box & Papers dated October 2025

The reverse side reveals Habring's patented Manufacture A11S caliber which beats at 4Hz and carries approximately 48 hours of power reserve

5mm x 50mm lug-to-lug

The 18 karat white gold case measures 42mm x 14mm x 50mm lug-to-lug and is in excellent condition

Otsuka Lotec No. 6 - Serial #10328 (Pre-Owned) SARPANEVA Horology By The Sea isCrafted by the visionary Jiro Katayama in his Tokyo studio, the No. 6 is a masterclass in industrial brutalism and mechanical ingenuity. Courtesy of a module designed and built by Mr. Katayama, time is displayed by way of two steel hands which travel from left to right then retrograde back, the minute hand every 60 minutes, and the hour hand once every 12 hours. The date can be viewed in the small aperture at the 3: 30 position. The reverse side