Armin Strom , Gravity Equal force- System 78 Year: 2020 The Gravity Equal Force is the world’s first automatic watch with constant force transmission. The result is consistent power delivery to the balance which ensures that the watch always delivers flawlessly constant precision. Stainless steel Case Self-winding movement Visible micro-rotor and the newly-developed Equal Force Barrel Ingenious stop-work declutch system that operates inside the mainspring barrel to provide more consistent power delivery to the balance at every stage. Sapphire crystal and case back with anti-reflective treatment Diameter: 41.00 mm Height: 12.65 mm Water-resistance: 30 m Blue and salmon Dial Offset with subdial Stainless steel with hand finishing Alligator leather strap Pin buckle in stainless steel The watch is in excellent condition Never been polished Sold full set With our 18 months warranty