Patek Philippe. A very rare and attractive stainless steel anti-magnetic wristwatch, signed Patek Philippe, Genève, a magnetic, ref. 3417, movement no. 730’171, case no. 2’618’192, manufactured in 1961. Case screw back, 35 mm  diam, signed. Estimate CHF 25,000-45,000. Offered in Rare Watches on 11 November 2019 at Christie’s in Geneva