Sartory-Billard SB10 Jump Hour – Sapphire Black (Pre-order) Strap or Bracelet:Rubber Strap

Sartory-Billard SB10 Jump Hour – Sapphire Black (Pre-order) Strap or Bracelet:Rubber StrapThis is a pre order with delivery expected June 2026. All prices include US tariffs and duties. Local sales tax, however, may apply, and are calculated at check out. Email: shop@collectivehorology. com Phone: +1 (805) 321 8877 Text (US Only): +1 (805) 321 8877 A Jumping Hour With Nothing to Hide The SB10 Black Sapphire replaces the traditional dial with a smoked sapphire cabochon that offers a veiled glimpse into the watch's mechanical architecture

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7mm sapphire dial with internally lasered 3D “Mosaic

1 with 19 Jewels and a 53-hour power reserve and stop second

escapements

Each dial is produced in Los Angeles

The sword hour hand points to the gaps like a ship seeking entrance into a harbour

Strap is creased from wear and shows signs of regular use

Power reserve indicator at 3 o'clock

Dial: Laser-milled from a single block of titanium into radial "strakes

Strap: 20×18mm black alcantara by Jean Rousseau Paris

Handmade three-dimensional guillochage with registered motif

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