PUW-Cal 1563 T “Porta”
Gentleman’s automatic wristwatch by Porta, circa 1971, with Autorotor, in heavy three-piece stainless steel case with screwed back. Rotor with heavy metal ring winding in both directions via reverser wheel (at 6 o’clocl), disengages when manually wound, high oscillation plain nickel balance wheel, Nivarox spring, Incablock-shock resistance.
