Delma Caliber DT100.01 Watch Movement

Brand	Delma
Caliber Number	DT100.01
In-House?	No (manufacture)
Exclusive?	Yes
Movement Type	Mechanical, manual-wind, tourbillon
Diameter	31.8mm
Height	6.5mm
Jewel Count	19
Beat Rate/ Frequency	21,600 bph / 3 Hz
Lift Angle	Unconfirmed
Accuracy Rating	-4~+6 sec/day
Power Reserve	105 hours
Anti-Shock Device	Kif
Balance Wheel	Glucydur
Hand Count	3
Functions	Central hours; central minutes; 1-minute tourbillon at 6:00 with seconds hand display
Hacking Seconds?	No
Country of Manufacture	Switzerland, Swiss made
Known Models	Delma 1924 Tourbillon (Add your watch to the comments below…)

Delma caliber DT100.01 is a tourbillon watch movement with 19 jewels and a frequency of 3 Hz (21,600 beats per hour). This movement is found in the Delma 1924 Tourbillon watch, introduced in 2024 as part of the 100th anniversary of the brand.

In Delma’s own words:

“DELMA’s custom designed Tourbillon is equipped with bespoke features for superior precision. The escapement and regulating organ are contained within a cage that revolves 360° every 60 seconds. As this cage rotates, any positional errors are negated. A hand affixed to the cage also serves to indicate the running seconds. The variable-inertia balance contributes to the extreme accuracy while C-shaped masselottes positioned on the spokes of the balance wheel mitigate air perturbation.” –Source

Some of the topics covered in this caliber listing:

Base Movement:

Although Delma describes the DT100.01 as “proprietary”, it appears to be based on the BCP Tourbillon SA caliber T02 framework by French watchmaker Olivier Mory, based in La Chaux-de-Fonds, Neuchâtel, Switzerland. Some watch enthusiasts may mistake the word proprietary for in-house, but it is more of a manufacture movement with proprietary aesthetics for Delma.

See the drawing of the T02 below:

There are some of the noticeable design differences which make it a cal. DT100.01 and not a T02:

The bridge design/cutouts
The double spoke skeletonized ratchet wheel
The seconds hand on the tourbillon

Finishing:

Damaskeening (stripes) on the bridges
Perlage on the dial side base plate
Ruthenium-treated with dark grey finish

100% Swiss:

Delma also described the DT100.01 as “100% Swiss”, listing Atokalpa as a local partner for sourcing components.

Accuracy:

According to Delma, the DT100.01 is tested in 6 positions and is capable of an average accuracy rating of -4/+6 seconds per day. This performance puts the DT100.01 in the range of chronometer spec, although it is not COSC certified.