Armin Strom Gravity Equal Force "Tranquility" Special Edition #8/15 (Pre-Owned)Give your wrist the blues in the best way possible with the Armin Strom Gravity Equal Force "Tranquility Topper Edition. Featuring a grain dorge guilloch backplate executed by the workshop of Kari Voutilainen and a fum dial which is darkest in the center and lightens at the periphery. The movement is Armin Strom's signature Gravity Equal Force calibre, the worlds first automatic winding watch with constant force transmission. The movement operates at