International Watch Co., Schaffhausen, Automatic, «Portofino» , Ref. 3513-018. | Important Contemporary Collector's Wristwatches | Geneva, Hotel Des Bergues, 23rd March 1997 International Watch Co., Schaffhausen, Automatic, «Portofino» Ref. 3513-018., CHF 620 - 1,975Sold: CHF 1,380 Self-winding, center second, stainless steel gentleman's wristwatch with date and stainless steel integrated bracelet. Diam. 34 mm.