It’s a reversing system for tandem winding, basically the same as you’d find in the reverser wheels of an ETA or Rolex movement. There is another click underneath the ratchet wheels to retain the mainspring, as can be seen in this image from Amanico . It'

In 2022, Grand Seiko presented its first mechanical complication, the Kodo Constant-force Tourbillon, a revolutionary watch that combined a tourbillon and a constant-force mechanism as one unit on a single axis for the first time in horological history. A

Absolutely brilliant work. Their pieces on the GS Kodo tourbillon were also amazing: watchesbysjx.com watchesbysjx.com

The Grand Seiko Kodo Constant-force Tourbillon SLGT003 was awarded the Chronometry Prize at the 2022 Grand Prix d’Horlogerie de Genève; for its remarkable precision timekeeping performance. On November 10, the 2022 Grand Prix d’Horlogerie de Genève award

2022 GPHG Winners Aguille d'Or: Greubel Forsey Tourbillon or Seiko Kodo Tourbillon. Ladies': Konstantin Chaykin Harley Quinn - because why not? We all want a "naughty girl" every now and then to win something. This one is the watch you get for your girlfr

Aguille d'Or: Grand Seiko Kodo Constant Force Tourbillon Ladies': Chopard Alpine Eagle 33 Ladies' Complication: Chaumet Sous Le Soleil Creative Complication Timepiece Men's: zenith calibre 135 Men's Complication: PF Tonda PF GMT Rattrapante Iconic: GP Cas

And they have to try to recoup some of that expense. No doubt there are many other experiments that DON'T make it to production, and this watch is helping pay for them too. Cazalea

That's a patent for a double-axis tourbillon with constant force! Didn't realise Seiko was working on one I believe the rationale of the design is that a remontoir will provide a smoother constant force to the rotation of the tourbillon cages. Having a sm

Because there are so few people in the world with the ability to conceive, refine, explain, patent multiple aspects of it, design and actually build it. And then train someone else to build and service it! Just take my word for it, mortgage your house, an

I am obsessed with this watch, can't stop watching this So Beautiful and Sublime. S