A professional, fact-based description of the Breuget Classique Tourbillon Extra-Plat Squelette 5395 reveals a wristwatch with exceptional complexity and precision. This self-winding timepiece features a peripheral oscillating weight and innovative use of silicon for the balance spring and escape wheel. The tourbillon shaft displays running seconds on the chapter ring, featuring Roman numerals etched on sapphire. The sapphire caseback ensures water-resistance up to 3 bar (30m).