• A visual inspection of the movement for any aesthetically challenged movements.
• 3 (or more) proper power up and wind down cycles to ensure that each movement allows for 30+ hours of mainspring performance.
• Inspection of the movement’s rotor bearings and retaining screw to make sure that they are neither too loose, too tight nor worn.
• All movements must meet the individual caliber’s specification by means of an electronic timing evaluation to qualify for assembly into each Duboule product.

Each case in the Duboule collection is made from high grade 316L series stainless steel. Watch cases produced from this quality of steel material appear silver in color with craftsmanship and precision that is applied to many European watch styles and brands as well.

The crisp design lines, sharp edges, clean round holes and clear reflections are all hallmarks of these watch cases. Polishing finesse and proper polishing materials result in a satin finish with a discernable rainbow effect. The optical clarity of the mirror polishing on convex and faceted watch case faces approach a reflective appearance.

Each case has also been designed for the casual watch admirer’s point of view. While wearing a watch, often others see the watch from a only side view due to the piece being on the wearer’s wrist. So for a more aesthetic look, the cases have been fashioned with an ergonomic design and much intricate detail that’s pleasing to the eye.

Each case also goes through a rigorous assembly and testing process which includes… A "wet" water resistance inspection prior to assembly. The actual water testing is conducted upon empty cases which is more reliable than vacuum or high air pressure methods and avoids damage to the movement in the event of a case failure. A vacuum test in then completed on the finished product. Qualified cases are assembled in climate controlled production facilities before a final visual inspection and time setting are performed before the start of a 60 hour "burn-in" cycle. During this cycle, the watch heads are evaluated on two planes; 30 hours placed on crystal, 30 hours placed on back. A percentage of each lot is sent for movement timing evaluation after each 30 hour period. Then the movements and dials are added by the assembly team before being retuned to the "burn-in" vault for another 24 hours.

The leather straps for the Duboule line are fashioned with a special remborde technique.

The top layer is folded around and under the bottom layer to reduce the chances of water and/or perspiration damaging the inner layer of the strap. The top and bottom pieces of leather are the placed in a precision mold so that a press bonds the two pieces together under extreme heat & pressure. This process helps not only mold the strap into a thin line but also makes it almost impervious to moisture without weakening the strap in any way.

The coloration of these bands has also been taken into strict considerations. Not only has an alligator texture been applied to the cowhide leather upper layer but also a unique stylization that gradually shifts from light to dark as well. This specific choice of texture and hue is meant to compliment the shifting angles and highlights of the dials.