1962 International watch co Ref. R 647A - Iwc Cal.8531 in near Mint condition automatic large wristwatchThis Watch Here we have a beautifully curvaceous 1962 IWC Automatic Cal. 8531 Calatrava, reference R 647A a particularly desirable example thanks to its rarer Jumbo 36. 5mm stainless steel case. The case is a masterclass in early 60s IWC restraint: brushed and polished finishing throughout, slim polished bezel, and those wonderfully curved, drilled lugs that help it sit flat and comfortable on the wrist. Measurements are 43mm lug to lug and