U boat watch classico 53 black widow the u boat classico 53 black widow boasts a 53mm 18ct pink gold case which has been completely coated in lustrous black diamonds the beautiful bezel surrounds a two superimposed layers one matte black and one carbon fibre to add an extra dimension to the dial and create texture the beautiful hand assembled movement is visible from the caseback through a sapphire crystal glass finished with a vintage strap featuring gold and sterling silver finishes toget