The Ulysse Nardin Classico Manufacture (Ref. 3203-136) is a sophisticated, discontinued Swiss luxury dress watch celebrated for combining a slim profile with advanced in-house micromechanics. Depending on the specific suffix variation (such as -2/33 or -2/E3), the reference spans classic sun-ray finishes as well as the brand's highly acclaimed, labor-intensive Grand Feu enamel dials. 

The watch is driven by the proprietary In-House Calibre UN-320, which stands out in modern horology for its material innovation and user-friendly features: 

• Silicon Technology: Features a silicon hairspring and a lubrication-free silicon anchor escapement, dramatically reducing mechanical friction and enhancing longevity. 

• Power Reserve: 48 hours beating at a frequency of 28,800 vibrations per hour (4Hz).

• Bi-directional Quick-set Date: Unlike traditional movements that can bend internal gears if set at the wrong time, the UN-320 allows the date to be adjusted both forward and backward safely at any time.

• Dial Layout: Features a symmetrical arrangement with a small seconds sub-dial and a seamlessly integrated date window at the 6 o'clock position.

• Case Dimensions: 40mm diameter x 9.6mm to 10.2mm thickness (varying slightly by dial type)

• Case Material: Stainless steel (316L)

• Crystal & Case-back: Scratch-resistant sapphire crystal on both front and back

• Water Resistance: 30 meters (3 ATM)

• Strap: Blue alligator/crocodile leather with a steel pin-buckle