U-BOAT Capsoil DarkMoon 44mm Oil Filled Swiss Quartz Movement U-Boat Bracelet


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We take trades against any of our watches!!! We also buy watch packages!!

The U-Boat Capsoil collection was officially announced in November 2018. They just released the second iteration of this concept called Darkmoon. This new line takes on a more minimalist approach with a lower entry price, but looking at it, we can’t help thinking about other oily timepieces – because in the watch industry, there is nothing new under the sun, or moon for that matter (watch brands love the moon, especially the dark side for some reason).

Back in 2013, Ressence introduced the liquid filled Type 3 at Baselworld. It turns out the the “liquid” was… oil. The Type 3 received mixed reactions from the community, but mostly because of its $30,000 USD price tag.

Although both are oil-filled watches that look futuristic and cool, they cannot be compared from an engineering and design standpoint. The big difference between the Capsoil and the Type 3 (and Type 5) is that the Ressence is a mechanical watch, and the Darkmoon is powered by a Swiss quartz movement. Although, it appears that U-Boat listened to criticism about it being a quartz watch and newer models have a solid caseback with no running seconds hand (making it less obvious that it’s a quartz watch).

The movement is a 2-handed Swiss Rhonda Caliber 12 with a battery life of about 60 months. The dials of the Capsoil/Darkmoon models have red text that reads: Working Between 0/+60 degrees Celsius. Interestingly, the Ronda tech sheets list the operating temperature of the 712 to be 0-50 C.

A quartz movement makes sense, because a mechanical watch will not operate when fully submerged in oil. Ressence was able to overcome this obstacle by inventing a dual-chamber case with oil injected into the upper half and air at the bottom where the movement is housed.

The innovation didn’t stop there. When it launched, the Ressence Type 3’s claim to fame was that it was a crownless watch which is wound and set by rotating the bottom (air-filled) half of the case. The U-Boat Capsoil isn’t crownless, but they did make it a destro piece by moving the slim crown to the left of the case.


BRAND: U-boat

MODEL: Capsoil Darkmoon

MOVEMENT: Swiss Quartz

CASE: Stainless Steel

CROWN: Screw-Down Crown

SIZE: 44mm

LUGS: 22mm

DIAL: Black Oil Filled DIAL

BEZEL: Non-rotating

CONDITION: Pre-owned – As-New!

BOXES/PAPERS: Yes/Yes: 100% Complete U-Boat box set, Warranty cards, Polishing cloth, etc! – Everything in pictures


STRAP/BRACELET: – Original U-boat Stainless Steel Mesh Bracelet with signed stainless steel buckle.


Trades welcome!!

Let us know what you have in your collection!! I consider all watches in trade! Please upload pictures.

and include details of your trades through my Trade/Buy tab at the top of my homepage.