Roger Dubuis Knights of the Round Table Monotourbillon (Ref: RDDBEX1025)
The Roger Dubuis caliber RD 115 is a manual-wind tourbillon movement found in the brand’s Knights of the Round Table Monotourbillon watch. Announced at Watches & Wonders on March 30, 2022, the cal. RD115 is the first central flying tourbillon produced by Roger Dubuis – a feat the brand calls Hyper Horology.
In the brand’s own words:
“Central flying monotourbillon with variable inertia balance wheel, including 72 hours of power reserve”
“Just as the twelve knights take their duty to protect the realm seriously, the Maison’s quest for peak performance is realised by expanding the diameter of the balance wheel to increase stability and ensure the movement is less sensitive to gravity’s effects.” -Enter the Hyper World of Rofer Dubuis: Unleashed Creativity Meets Rare Technical Prowess (Press-Release, March 30, 2022)
Some of the topics covered in this caliber listing:
How to Read the Time?
The “hands” are gold pieces inserted into the translucent sapphire discs. The hour hand is comprised of two wider gold pieces, whereas the minute hand is formed from three narrower pieces.
“Such an exceptional timepiece had to feature equally exceptional hands, fully integrated into the circular design. That’s why two gold markers were chosen to indicate the position of the minute and hour with perfectly centred rotating discs.” -Enter the Hyper World of Rofer Dubuis: Unleashed Creativity Meets Rare Technical Prowess (Press-Release, March 30, 2022)
Setting the Time:
Watches with the RD115 movement has a button/pusher on the case above the crown at 2:00. Roger Dubuis calls this the Function Selection Pusher. To set the time, press the pusher. On the dial at 3:00, there will be a red marker (plate) below the knight.
When this red marker is visible, you can proceed with setting the time. Turn the crown clockwise to advance the hour/minute indicators. Once the time is set, push the button again and the red marker will disappear.
When you want to wind the movement, double check to make sure the Function Selection Indicator is not showing. If it is, just press the button again to switch modes.
The RD115 is capable of 72 hours of power reserve on a full wind. To fully wind the movement, rotate the crown about 45 times. Do not over-wind it.
Roger Dubuis writes this caliber as “RD 115” on their main movement information page. The brand also writes this caliber number as “RD115” on the official instruction manual. You may see most of the watch blogs writing it as RD115, however, the real answer is that none of us actually know. Roger Dubuis is another one of those brands that can’t make up their minds on the correct way to spell their caliber numbers. For a caliber researcher and editor, it can be frustrating. Both spellings are used here for SEO purposes – perhaps that was the brand’s intention as well (pro tip: get rid of the space).